WO2022134665A1 - 基于循环移位分集序列的通信方法、装置及系统 - Google Patents
基于循环移位分集序列的通信方法、装置及系统 Download PDFInfo
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Definitions
- the present application relates to the field of communication technologies, and in particular, to a communication method, device, and system based on a cyclic shift diversity sequence.
- Multi-input multi-output (MIMO) technology is a major breakthrough in smart antenna technology in the field of wireless mobile communications. This technology can multiply the performance of communication systems without increasing bandwidth through spatial multiplexing and spatial diversity. capacity and spectrum utilization.
- MIMO Multi-input multi-output
- the transmitter and receiver use multiple transmit and receive antennas respectively, allowing multiple transmit antennas to transmit multiple spatial streams simultaneously, or allow multiple receive antennas to simultaneously receive multiple spatial streams.
- the Institute of Electrical and Electronics Engineers has developed an orthogonal frequency division multiplexing (OFDM) technology.
- OFDM orthogonal frequency division multiplexing
- IEEE introduced MIMO technology in WLAN starting from 802.11n protocol, which supports a maximum of 4 spatial streams.
- the 802.11ac protocol expands the maximum number of spatial streams from 4 streams to 8 streams, and the 802.11ax protocol inherits the maximum number of spatial streams of the 802.11ac protocol.
- the present application provides a communication method, device and system based on a cyclic shift diversity sequence, which can improve system capacity and spectral efficiency, and can also reduce the gain setting error of automatic gain control (AGC).
- AGC automatic gain control
- the present application provides a communication method based on a cyclic shift diversity sequence.
- the method can be executed by a first communication device, or a component of the first communication device, such as a processor or a chip of the first communication device. , or a system-on-a-chip, etc., the present application takes the first communication device executing the method as an example for description.
- the method includes: the first communication device generates a physical layer protocol data unit PPDU, the PPDU includes a short training field STF, a long training field LTF, and a data field, the STF, the LTF, and the data field are based on cyclic shift diversity CSD Determined by the sequence, the CSD sequence includes L elements, where L is the maximum number of spatial streams supported by the first communication device, and the maximum number of spatial streams is greater than or equal to 16; the first communication device sends the PPDU to the second communication device.
- the maximum number of spatial streams can be expanded to 16 streams, which is suitable for communication scenarios with large communication requirements and large data volumes, and improves system capacity and spectral efficiency.
- limiting the number of spatial streams to 16 streams can reduce the requirement for the number of antennas of access points or non-access point sites, thereby reducing the number of access points or non-contact points.
- the access point or non-access point can support a larger number of antennas, and the communication demand increases, the The maximum number of spatial streams is extended to more than 16 streams, such as 32 streams or 64 streams, in order to further improve system capacity and spectral efficiency.
- the present application also uses corresponding CSD sequences for STF, LTF, and data fields to reduce the correlation between STFs on each spatial stream, so that the When the power is used for AGC, the gain setting error of the AGC is reduced.
- the first communication device sending the PPDU to the second communication device includes: the first communication device sending the PPDU to the second communication device through K spatial streams, where K is less than or equal to L positive integer.
- the first communication apparatus may transmit the PPDU using less than L spatial streams.
- the first communication device can send the PPDU according to the actual channel.
- the condition determines that less than L spatial streams are used to transmit the PPDU to maximize the spectral efficiency as much as possible.
- K may be equal to L, that is, the first communication apparatus transmits the PPDU through L spatial streams, so as to maximize the spectral efficiency.
- the STF, the LTF, and the data field are determined from the first K elements of the CSD sequence. It can be understood that the first K elements of the CSD sequence are respectively the cyclic shift values corresponding to the K stream spatial streams. Based on this possible design, when sending a PPDU through the K spatial streams, the first K elements of the CSD sequence are used. Determining the STF, LTF, and data fields enables correct cyclic shifts on the spatial streams of each stream, thereby reducing the correlation between the STFs of the spatial streams.
- L is equal to 16
- the first 8 elements of the CSD sequence are: 0, -400, -200, -600, -350, -650, -100, -750, and the last The 8 elements include: -550, -250, -500, -150, -700, -50, -450, -300.
- the first 4 elements of the CSD sequence provided by this application are the CSD values of streams 1 to 4 of the 802.11n protocol
- the first 8 elements are the CSD values of the 1 to 8 streams of the 802.11ac protocol or 802.11ax protocol.
- the CSD sequence can be compatible with the 802.11n protocol, the 802.11ac protocol, or the 802.11ax protocol, which is beneficial to the smooth evolution of the system.
- the 802.11n protocol is compatible, the data packets of the 802.11n protocol are to be sent, or, when the 802.11ac/802.11ax protocol is compatible, the data packets of the 802.11ac/802.11ax protocol are to be transmitted.
- the CSD sequence provided in the present application can be directly used for cyclic shift, which can reduce the implementation complexity compared with using multiple standard CSD sequences to respectively perform cyclic shift of corresponding standard data packets.
- L is equal to 16
- the first element of the CSD sequence is 0, and the last 15 elements of the CSD sequence include: -550, -225, -675, -325, -100, -450, -275, -500, -50, -725, -600, -375, -150, -575, -475.
- this application provides a CSD sequence that is not compatible with the 802.11ac protocol or the 802.11ax protocol.
- the first criterion value is smaller than the first criterion value of the correlation matrix corresponding to the first P elements of the CSD sequence of the 802.11ac protocol or 802.11ax protocol.
- the first P elements of the CSD sequence correspond to the correlation matrix
- the second criterion value is smaller than the second criterion value of the correlation matrix corresponding to the first P elements of the CSD sequence of the 802.11ac protocol or the 802.11ax protocol, respectively. That is to say, the CSD sequences that are not compatible with the 802.11ac protocol or the 802.11ax protocol proposed in this application can further reduce the correlation between the STFs of each spatial stream when the number of spatial streams is 2 to 7 streams.
- the present application provides a communication method based on a cyclic shift diversity sequence.
- the method can be executed by a second communication device, or by a component of the second communication device, such as a processor or a chip of the second communication device. , or a system-on-a-chip, etc.
- This application takes the second communication device executing the method as an example for description.
- the method includes the second communication device receiving a physical layer protocol data unit PPDU from the first communication device, the PPDU including a short training field STF, a long training field LTF, and a data field, the STF, the LTF, and the data field being Determined according to the cyclic shift diversity CSD sequence, the CSD sequence includes L elements, L is the maximum number of spatial streams supported by the first communication device, and the maximum number of spatial streams is greater than or equal to 16; the second communication device according to the PPDU to be processed.
- the second communication device receiving the PPDU from the first communication device includes: the second communication device receives the PPDU from the first communication device through K spatial streams.
- the STF, the LTF, and the data field are determined from the first K elements of the CSD sequence.
- L is equal to 16
- the first 8 elements of the CSD sequence are: 0, -400, -200, -600, -350, -650, -100, -750, and the last The 8 elements include: -550, -250, -500, -150, -700, -50, -450, -300.
- L is equal to 16
- the first element of the CSD sequence is 0, and the last 15 elements of the CSD sequence include: -550, -225, -675, -325, -100, -450, -275, -500, -50, -725, -600, -375, -150, -575, -475.
- the present application provides a communication device for implementing the above-mentioned various methods.
- the communication device may be the first communication device in the first aspect, or a device including the first communication device, or a device included in the first communication device, such as a chip; or, the communication device may be the second communication device.
- the second communication device in the aspect, or a device including the above-mentioned second communication device, or a device included in the above-mentioned second communication device, such as a chip.
- the communication device includes corresponding modules, units, or means (means) for implementing the above method, and the modules, units, or means may be implemented by hardware, software, or by executing corresponding software in hardware.
- the hardware or software includes one or more modules or units corresponding to the above functions.
- the communication device may include a processing module and a transceiver module.
- the transceiver module which may also be referred to as a transceiver unit, is used to implement the sending and/or receiving functions in any of the above aspects and any possible implementation manners thereof.
- the transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
- the processing module may be used to implement the processing functions in any of the foregoing aspects and any possible implementation manners thereof.
- the transceiver module includes a sending module and a receiving module, which are respectively used to implement the sending and receiving functions in any of the above aspects and any possible implementation manners.
- the communication device provided in the third aspect is used to execute any of the above aspects or any possible implementation manner of any aspect.
- the present application provides a communication device, comprising: a processor and a memory; the memory is used for storing computer instructions, when the processor executes the instructions, so that the communication device executes any of the above-mentioned aspects. method.
- the communication device may be the first communication device in the first aspect, or a device including the first communication device, or a device included in the first communication device, such as a chip; or, the communication device may be the second communication device.
- the second communication device in the aspect, or a device including the above-mentioned second communication device, or a device included in the above-mentioned second communication device, such as a chip.
- the present application provides a communication device, comprising: a processor and a communication interface; the communication interface is used to communicate with modules other than the communication device; the processor is used to execute a computer program or instruction to enable the The communication device performs the method of any of the above aspects.
- the communication device may be the first communication device in the first aspect, or a device including the first communication device, or a device included in the first communication device, such as a chip; or, the communication device may be the second communication device.
- the second communication device in the aspect, or a device including the above-mentioned second communication device, or a device included in the above-mentioned second communication device, such as a chip.
- the present application provides a communication device, comprising: an interface circuit and a logic circuit, the interface circuit is used for acquiring input information and/or outputting output information; the logic circuit is used for executing any one of the above-mentioned aspects or any one aspect
- the method described in any possible implementation manner performs processing and/or generates output information according to input information.
- the present application provides a communication device, comprising: at least one processor; the processor is configured to execute a computer program or instruction stored in a memory, so that the communication device executes the method described in any one of the above aspects.
- the memory may be coupled to the processor, or it may be independent of the processor.
- the communication device may be the first communication device in the first aspect, or a device including the first communication device, or a device included in the first communication device, such as a chip; or, the communication device may be the second communication device.
- the second communication device in the aspect, or a device including the above-mentioned second communication device, or a device included in the above-mentioned second communication device, such as a chip.
- the device is a chip or system of chips.
- the device may be composed of chips, or may include chips and other discrete devices.
- the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, when the computer-readable storage medium runs on a communication device, the communication device can perform the method described in any one of the above aspects.
- the present application provides a computer program product comprising instructions which, when executed on a communication device, enable the communication device to perform the method of any of the above aspects.
- the communication device provided in any one of the third to ninth aspects is a chip
- the above-mentioned sending action/function can be understood as outputting data or information
- the above-mentioned receiving action/function can be understood as inputting data or information.
- the present application provides a communication system, which includes the first communication device and the second communication device described in the above aspects.
- FIG. 1 is a schematic diagram 1 of a frame structure of a PPDU according to an embodiment of the present application
- FIG. 2 is a second schematic diagram of a frame structure of a PPDU according to an embodiment of the present application
- FIG. 3 is a schematic diagram 3 of a frame structure of a PPDU according to an embodiment of the present application.
- FIG. 4 is a fourth schematic diagram of a frame structure of a PPDU according to an embodiment of the present application.
- FIG. 5a is a schematic structural diagram of a communication system provided by an embodiment of the present application.
- FIG. 5b is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application.
- FIG. 6 is a schematic structural diagram of an access point and a non-access point site according to an embodiment of the present application.
- FIG. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.
- FIG. 8 is a schematic flowchart of a communication method based on a CSD sequence provided by an embodiment of the present application.
- FIG. 9 is a schematic flowchart of determining a CSD sequence provided by an embodiment of the present application.
- FIG. 10 is a schematic diagram of a comparison of AGC power errors provided by an embodiment of the present application.
- FIG. 11a is a schematic diagram of a comparison of another AGC power error provided by an embodiment of the present application.
- FIG. 11b is a schematic diagram of a comparison of another AGC power error provided by an embodiment of the present application.
- FIG. 12 is a schematic structural diagram of a first communication apparatus according to an embodiment of the present application.
- FIG. 13 is a schematic structural diagram of a second communication apparatus according to an embodiment of the present application.
- At least one (a) of a, b, or c may represent: a, b, c, a and b, a and c, b and c, a and b and c, where a, b, c Can be single or multiple.
- words such as “first” and “second” are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that the words “first”, “second” and the like do not limit the quantity and execution order, and the words “first”, “second” and the like are not necessarily different.
- the PPDU frame structure of the high throughput (high throughput, HT) mixed mode in the 802.11n standard is shown.
- the HT PPDU is divided into two parts according to the modulation method. Among them, one is the part set for compatibility with traditional frames, called pre-HT modulation field, which includes traditional short training field (legacy-short training field, L-STF), traditional long training field (legacy-long field) training field (L-LTF), legacy-signal field (L-SIG), and high-throughput signal field (HT-SIG).
- pre-HT modulation field which includes traditional short training field (legacy-short training field, L-STF), traditional long training field (legacy-long field) training field (L-LTF), legacy-signal field (L-SIG), and high-throughput signal field (HT-SIG).
- L-STF long training field
- L-LTF legacy-signal field
- H-SIG high-throughput signal field
- HT field high throughput short training field
- HT-LTF high throughput long training field
- VHT very high throughput
- the VHT PPDU is also divided into two parts.
- One of them is the pre-VHT field compatible with the traditional frame structure, which includes L-STF, L-LTF, L-SIG, and very high throughput signaling field A (very high throughput signal field A, VHT-SIG -A).
- the other is the part using VHT modulation, called VHT domain, including very high throughput short training field (VHT-STF), very high throughput long training field (very high throughput long training field) , VHT-LTF), very high throughput signaling field B (very high throughput signal field B, VHT-SIG-B), and data (Data) field.
- VHT-STF very high throughput short training field
- VHT-LTF very high throughput long training field
- VHT-LTF very high throughput signaling field B
- Data data
- the PPDU frame structure in the high efficiency (high efficiency, HE) mode in the 802.11ax standard is shown.
- the HE PPDU is also divided into two parts.
- One of them is the pre-HE field, which includes: L-STF, L-LTF, L-SIG, repeated legacy-signal field (RL-SIG), high-efficiency signaling field A (high efficient signaling field) -signal field A, HE-SIG A), high efficient-signal field B (high efficient-signal field B, HE-SIG B).
- the other is the HE modulation field, which includes high efficient-short training field (HE-STF), high efficient-long training field (HE-LTF), and data.
- the PPDU may further include a data packet extension (packet extension, PE).
- the EHT PPDU may include three parts: a legacy preamble (L-preamble), a high efficiency preamble (HE-preamble) and a physical layer convergence protocol service data unit (PSDU) .
- L-preamble legacy preamble
- HE-preamble high efficiency preamble
- PSDU physical layer convergence protocol service data unit
- the L-preamble part includes the L-STF field, the L-LTF field, and the L-SIG field;
- the HE-preamble part includes the RL-SIG field and the universal field (universal SIG, U-SIG) field, extremely high throughput signaling (EHT-SIG) field, extremely high throughput short training field (EHT-STF) field, extremely high throughput long training field (EHT-LTF) field;
- the PSDU part includes Fields such as the data (data) field, where the U-SIG field occupies 2 OFDM symbols, such as U-SIG SYM1 and U-SIG SYM1 as shown in FIG. 4 .
- the Universal Field (U-SIG) field may include a version independent info field, a version dependent info field, a cyclic redundancy code (CRC) field, and a tail field.
- the version independent info field may contain a 3-bit wireless fidelity (WiFi) version field, a 1-bit downlink/uplink field, a BSS color field of at least 6 bits, and a transmission opportunity (TXOP) field of at least 7 bits. .
- the version independent info field may also include a bandwidth field.
- the version dependent info field may include a PPDU format field, etc., and may also include one or more of a modulation and coding scheme field, a spatial stream field, a coding field, and the like.
- the CRC field occupies at least 4 bits
- the tail field occupies at least 6 bits of the tail bit field.
- the EHT-SIG field includes the EHT-SIG common field and the EHT-SIG user-specific field, wherein the EHT-SIG common field can be used to carry the resource allocation information allocated to the site, and the EHT-SIG user-specific field Can be used to carry user information.
- EHT-PPDU is only an example, and other structures may also be present in the standard formulation process or the technology development process, which is not limited in this application.
- IEEE introduced the MIMO technology on the basis of the OFDM technology.
- the PPDU is mapped to multiple spatial streams for transmission.
- the STF transmits the same sequence, and the Data field transmits different service data.
- the receiver performs automatic gain control (AGC) gain settings with reference to the power of the HT-STF on each spatial stream, and uses this gain to adjust the power of the HT-Data field on the corresponding spatial stream .
- AGC automatic gain control
- the receiving end refers to the power of the VHT-STF on each spatial stream to set the gain of the AGC, and uses this gain to adjust the power of the VHT-Data field on the corresponding spatial stream.
- the receiving end refers to the power of the HE-STF on each spatial stream to set the gain of the AGC, and uses the gain to adjust the power of the HE-Data field on the corresponding spatial stream.
- the STF sequence after the channel is prone to produce unnecessary beamforming (BF) effects, that is, when the phases of the STFs on different spatial streams are close to each other Forward superposition, reverse cancellation when the phase is opposite, from the overall point of view, the received power of STF changes in a large range, while the power of the Data part is relatively stable, that is to say, the power of the STF and Data fields If the ratio varies within a large range, there is a large error in the AGC gain setting.
- BF beamforming
- the sender when sending a PPDU, performs a certain time cyclic shift for each spatial stream in the HT modulation domain of the 802.11n standard PPDU, or the VHT modulation domain of the 802.11ac standard PPDU, or the HE modulation domain of the 802.11ax standard PPDU.
- Bit diversity cyclic shift diversity, CSD
- CSD cyclic shift diversity
- CSD values for streams 1 to 4 are defined in the 802.11n standard, as shown in Table 1 below.
- the first 400ns signal of the original data field is moved to the end of the data field; when the number of spatial streams is 3, the first stream spatial stream The cyclic shift value corresponding to the 2-stream spatial stream is -400ns, and the cyclic shift value corresponding to the third-stream spatial stream is -200ns; when the number of spatial streams is 4, the first-stream spatial stream does not perform cyclic shift, and the second The cyclic shift value corresponding to the stream spatial stream is -400ns, the cyclic shift value corresponding to the third stream spatial stream is -200ns, and the cyclic shift value corresponding to the fourth stream spatial stream is -600ns.
- CSD values for streams 1 to 8 are defined in the 802.11ac standard, as shown in Table 2 below. For related descriptions, reference may be made to the related descriptions in Table 1, which will not be repeated here.
- the 802.11ax standard follows the CSD value defined by the 802.11ac standard, that is, the CSD value shown in Table 2 is also used in the 802.11ax standard.
- 802.11ac/802.11ax is compatible with the CSD value design of 802.11n, in addition, the CSD values of streams 1 to 7 are the first 1 to 7 elements of the CSD value of 8 streams, respectively.
- spatial streams in this application may also be referred to as “space-time streams (space-time streams)", and the two may be replaced with each other, which is not specifically limited in this application.
- this application proposes a communication method based on CSD sequence to expand the spatial stream to 16 streams and above, so as to improve the Spectral efficiency, in addition, provides corresponding CSD sequences to reduce interference between STFs of individual spatial streams, reducing gain setting errors.
- the cyclic shift diversity-based method provided in this embodiment of the present application can be used in a first communication system, where the first communication system is a WLAN-MIMO system, which supports a first communication protocol, and the first communication protocol is relative to the second communication protocol
- the new communication protocol for example, the first communication protocol may be the 802.11be protocol or a new communication protocol relative to the 802.11be protocol
- the second communication protocol may be 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11 one or more of a.
- the maximum number of spatial streams defined by the first communication protocol is L, and L is a positive integer greater than or equal to 16. That is, the first communication protocol extends the maximum number of spatial streams to 16 streams, or more.
- FIG. 5a which is a schematic structural diagram of a first communication system 50 provided by the present application, the first communication system 50 includes at least one first communication device 501 and at least one second communication device 502 .
- the first communication device 501 supports the first communication protocol (for example, the 802.11be protocol), that is, the maximum number of spatial streams supported by the first communication device 501 is L. Further, the first communication device 501 may also support multiple WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
- the first communication protocol for example, the 802.11be protocol
- the first communication device 501 may also support multiple WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
- the second communication device 502 supports the first communication protocol (for example, the 802.11be protocol), that is, the maximum number of spatial streams supported by the second communication device is L. Further, the second communication device 502 may also support multiple WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
- the first communication protocol for example, the 802.11be protocol
- the second communication device 502 may also support multiple WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
- the first communication apparatus 501 supports the first communication protocol, which can also be understood as: the first communication apparatus 501 is a first communication protocol device (device).
- the second communication apparatus 502 supports the first communication protocol, which can also be understood as: the second communication apparatus 502 is a first communication protocol device. Therefore, the first communication apparatus 501 in this application may also be referred to as a first communication protocol device 501 , such as an 802.11be device 501 , and the second communication apparatus 502 may also be referred to as a first communication protocol device 502 , such as an 802.11be device 502 .
- the first communication device 501 or the second communication device 502 respectively includes at least one affiliated station (affiliated station, affiliated STA).
- the affiliated station may be an access point station (access point station STA, AP STA) or a non-access point station (non-access point station, non-AP STA).
- access point station STA access point station
- non-AP STA non-access point station
- a communication device whose affiliated site is an AP STA is called an access point
- a communication device whose affiliated site is a non-AP STA is called a non-access point site.
- the first communication device 501 may be an access point, and correspondingly, the second communication device 502 may be a non-access point site; or, the first communication device 501 may be a non-access point site, and the second communication device 502 is an access point; alternatively, both the first communication device 501 and the second communication device 502 are access points; alternatively, both the first communication device 501 and the second communication device 502 are non-access point sites.
- the first communication system may be as shown in FIG. 5b.
- the non-AP STA can implement the function of the AP, or in other words, the non-AP STA can be operated as an AP.
- a communication device whose affiliated site is a non-AP STA that can implement the AP function or a non-AP STA that can operate as an AP can be called a soft access point.
- the access points in this application may include soft access points, of course, the access points are not limited to soft access points.
- the access point in this application can be the access point for mobile users to access the wired network, and is mainly deployed in homes, buildings, and parks, with a typical coverage radius ranging from tens of meters to hundreds of meters. Of course, it can also be deployed. outdoors.
- the access point is equivalent to a bridge connecting the wired network and the wireless network.
- the main function is to connect the various wireless network clients together, and then connect the wireless network to the Ethernet.
- the access point may be a terminal device or a network device with a wireless fidelity (wireless fidelity, WiFi) chip.
- the access point may support a first communication protocol (eg, 802.11be protocol). Further, the access point can also support various WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
- a first communication protocol eg, 802.11be protocol
- WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
- the non-access point site in this application may be a wireless communication chip, a wireless sensor or a wireless communication terminal.
- a wireless communication chip for example, mobile phones that support WiFi communication, tablet computers that support WiFi communication, set-top boxes that support WiFi communication, smart TVs that support WiFi communication, smart wearable devices that support WiFi communication, and in-vehicle communication devices that support WiFi communication and a computer that supports WiFi communication.
- the non-access point station may support the first communication protocol (eg, 802.11be protocol). Further, the non-access point station can also support various WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
- the first communication protocol eg, 802.11be protocol
- various WLAN protocols such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
- the access point of the present application may include one or more antennas, that is, the access point may be a single-antenna or multi-antenna device.
- non-access point sites may include one or more antennas, ie, non-access point sites may be single-antenna or multi-antenna devices.
- FIG. 6 a schematic structural diagram of an access point and a non-access point site is shown, wherein both the access point and the site include a physical layer (physical layer, PHY) and a medium access control layer ( medium access control, MAC), the solution of this application is a protocol design on the PHY and MAC layers.
- PHY physical layer
- MAC medium access control
- FIG. 7 is a schematic diagram of a hardware structure of a communication apparatus 700 provided by the present application.
- the communication apparatus 700 includes a processor 701 and at least one communication interface (in FIG. 7 , the communication interface 704 is used as an example for illustration).
- the communication device 700 may further include a communication line 702 and a memory 703 .
- the processor 701 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors for controlling the execution of the programs of the present application. integrated circuit.
- CPU central processing unit
- ASIC application-specific integrated circuit
- Communication line 702 may include a path to communicate information between the aforementioned components.
- Communication interface 704 using any transceiver-like device, for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
- RAN radio access network
- WLAN wireless local area networks
- the memory 703 may be read-only memory (ROM) or other type of static storage device that can store static information and instructions, random access memory (RAM) or other type of static storage device that can store information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, CD-ROM storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being executed by a computer Access any other medium without limitation.
- the memory may exist independently and be connected to the processor through communication line 702 .
- the memory can also be integrated with the processor.
- the memory 703 is used for storing computer-executed instructions for executing the solution of the present application, and the execution is controlled by the processor 701 .
- the processor 701 is configured to execute the computer-executed instructions stored in the memory 703, thereby implementing the cyclic shift diversity-based communication method provided by the following embodiments of the present application.
- the computer-executed instructions in the embodiment of the present application may also be referred to as application program code or computer program code, which is not specifically limited in the embodiment of the present application.
- the processor 701 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 7 .
- the communication apparatus 700 may include multiple processors, such as the processor 701 and the processor 708 in FIG. 7 .
- processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
- a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).
- the communication apparatus 700 may further include an output device 705 and an input device 706 .
- the output device 705 is in communication with the processor 701 and can display information in a variety of ways.
- the output device 705 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a cathode ray tube (cathode ray tube, CRT) display device, or a projector (projector) and the like.
- Input device 706 is in communication with processor 701 and can receive user input in a variety of ways.
- the input device 706 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.
- a communication method based on cyclic shift diversity includes:
- the first communication apparatus generates a PPDU.
- the PPDU includes a short training field (short training field, STF), a long training field (long training field, LTF), and a data (Data) field.
- STF short training field
- LTF long training field
- Data data field
- the PPDU generated by the first communication device is a PPDU of the first communication protocol
- the STF and LTF included in the PPDU refer to non-traditional STF and non-traditional LTF, respectively.
- the PPDU frame structure generated by the first communication device may be as shown in FIG. 4
- the STF included in the PPDU involved in this application refers to EHT-STF
- the LTF refers to EHT-LTF.
- the STF, LTF, and data fields included in the PPDU are determined according to a CSD sequence, and the CSD sequence includes L elements.
- L is the maximum number of spatial streams defined by the first communication protocol, and the first communication device supports the first communication protocol, then L is also the maximum number of spatial streams supported by the first communication device, and the maximum number of spatial streams is greater than or equal to 16.
- the maximum number of spatial streams supported by the first communication device can also be understood as: the first communication device has the ability to send and receive L spatial streams, or in other words, the first communication device has a maximum of L spatial streams .
- the first communication device when it generates the PPDU, it may perform a cyclic shift on the original STF sequence, the original LTF sequence, and the original data sequence corresponding to the kth stream spatial stream according to the kth element in the CSD sequence, to obtain the The STF sequence, the LTF sequence, and the data sequence transmitted on the kth stream spatial stream, the STF sequence, the LTF sequence, and the data sequence are carried in the STF, LTF, and data fields, respectively.
- the first communication apparatus sends a PPDU to the second communication apparatus.
- the second communication device receives the PPDU from the first communication device.
- the first communication apparatus sends the PPDU to the second communication apparatus through K spatial streams.
- the second communication device receives the PPDU from the second communication device through the K spatial streams.
- K is a positive integer less than or equal to L.
- the data part of the PPDU is divided into K parts, which are respectively sent on the K spatial streams.
- This application does not limit the preamble part other than the data part in the PPDU.
- the first communication apparatus may transmit the PPDU using less than L spatial streams.
- L spatial streams due to the complexity and variety of the channel environment, it is not the case that the more the number of spatial streams, the higher the spectral efficiency or the transmission performance. Therefore, based on this solution, when the first communication device sends the PPDU, it can be determined according to the actual channel conditions. PPDUs are sent with fewer than L spatial streams to maximize spectral efficiency as much as possible.
- K may be equal to L, that is, the first communication apparatus transmits the PPDU through L spatial streams, so as to maximize the spectral efficiency.
- the STF, LTF, and data fields of the PPDU are determined according to the first K elements of the CSD sequence. That is, the elements of the CSD sequence actually used are related to the number of spatial streams that transmit PPDUs or map PPDUs.
- the second communication device may set the gain of the AGC according to the power of the STF of each spatial stream, and use the gain to adjust the power of the data field on the corresponding spatial stream. Since the first communication device of the present application uses the CSD sequence for the STF, LTF, and data fields, the error is low when the second communication device performs power adjustment of the data field according to the power of the STF.
- the second communication apparatus performs processing according to the PPDU.
- the second communication device may perform service processing according to the data carried in the data field of the PPDU, which is not specifically limited in this application.
- the maximum number of spatial streams can be expanded to 16 streams, which is suitable for communication scenarios with large communication requirements and large data volumes, and improves system capacity and spectral efficiency.
- limiting the number of spatial streams to 16 streams can reduce the requirement for the number of antennas of access points or non-access point sites, thereby reducing the number of access points or non-contact points.
- the access point or non-access point can support a larger number of antennas, and the communication demand increases, the The maximum number of spatial streams is extended to more than 16 streams, such as 32 streams or 64 streams, in order to further improve system capacity and spectral efficiency.
- the present application also uses corresponding CSD sequences for STF, LTF, and data fields to reduce the correlation between STFs on each spatial stream, so that the When the power is used for AGC, the gain setting error of the AGC is reduced.
- the first 8 elements of the first type CSD sequence provided by this application are: 0, -400, -200, -600, -350, -650, -100, -750, respectively.
- the CSD The last 8 elements of the sequence include: -550, -250, -500, -150, -700, -50, -450, -300.
- the CSD sequence may be:
- the CSD sequence could be:
- the CSD value corresponding to the 1st spatial stream is the 1th element in the CSD sequence, and 1 is a positive integer less than or equal to L; in other words, when the total number of spatial streams is 1 , the CSD sequence corresponding to the 1 stream is composed of the first 1 elements of the CSD sequence corresponding to the 16 streams provided by this application.
- the unit of elements in the CSD sequence is ns.
- the unit of the elements in the CSD sequence may be other time units, such as microseconds (microsecond, ⁇ s), which is not specifically limited in this application.
- the first 4 elements of the CSD sequence provided by this application are the CSD values of streams 1 to 4 of the 802.11n protocol
- the first 8 elements are the CSD values of the 1 to 8 streams of the 802.11ac protocol or 802.11ax protocol. That is to say, the CSD sequence can be compatible with the 802.11n protocol, the 802.11ac protocol, or the 802.11ax protocol, which is beneficial to the smooth evolution of the system.
- the 802.11n protocol is compatible, the data packets of the 802.11n protocol are to be sent, or, when the 802.11ac/802.11ax protocol is compatible, the data packets of the 802.11ac/802.11ax protocol are to be transmitted.
- the CSD sequence provided in the present application can be directly used for cyclic shift, which can reduce the implementation complexity compared with using multiple standard CSD sequences to respectively perform cyclic shift of corresponding standard data packets.
- the following provides a method for determining a CSD sequence, according to which the CSD sequence corresponding to the above 16 streams can be determined.
- the CSD sequence corresponding to the 16 streams provided in the above-mentioned application can also be determined by other methods, which is not specifically limited in this application.
- the method for determining the CSD sequence may include the following steps:
- the range of the discrete time set is determined according to the period of the STF.
- the largest element in the discrete-time set is less than or equal to the period of the STF.
- the time interval between any two adjacent elements in the discrete time set is equal, and the quotient of dividing the period of the STF by the time interval is the number of elements included in the discrete time set. Based on this, the elements in the discrete time set are all multiples of that time interval.
- the number of elements included in the discrete set is Q times the maximum number of spatial streams L, where Q is a positive integer greater than or equal to 2.
- the range of the discrete time set is [0, -800), and if the time interval is -25ns, the discrete time set is: [0-25-50-75-100- 125-150-175-200-225-250-275-300-325-350-375-400-425-450-475-500-525-550-575-600-625-650-675-700-725- 750-775].
- the time interval may also be other values, such as -12.5ns, -6.25ns, etc., which is not specifically limited in this application.
- the second initial set includes Y elements of the discrete time set
- the first initial set includes elements other than the Y elements in the discrete time set.
- the Y elements included in the second initial set form a CSD sequence defined by the second communication protocol.
- the second communication protocol as an 802.11ac protocol or an 802.11ax protocol as an example, Y is equal to 8, and the second initial set is: [0-400-200-600-350-650-100-750].
- the first initial set is: [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500 -525-550-575-625-675-700-725-775].
- the first Y elements of the CSD sequence are Y elements constituting the second initial set, and X is equal to L-Y.
- L is equal to 16 and Y is equal to 8, then X is equal to 8, that is, 8 selections are performed according to the first initial set and the second initial set.
- Second, add the mth element of the xth candidate set to the first Y+x-1 elements of the CSD sequence to obtain the mth selected set, where m 1, 2, ..., M, where M is the th
- the number of elements included in the x candidate sets, where the candidate set is a subset of the first initial set, x 1, 2, . . . , X.
- a first selected set is selected from the M selected sets, and the elements constituting the first selected set are taken as the first Y+x elements of the CSD sequence.
- the xth candidate set that is, the first candidate set, is the first initial set.
- the first initial set is: [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575 -625-675-700-725-775]
- the second initial set is [0-400-200-600-350-650-100-750] for example:
- the first candidate set is: [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625- 675-700-725-775], M equals 24.
- the first selected set is: [0-400-200-600-350-650-100-750-25];
- the second selected set is: [0-400-200-600-350-650-100-750-50];
- the third selected set is: [0-400-200-600-350-650-100-750-75];
- the 4th selected set is: [0-400-200-600-350-650-100-750-125];
- the 5th selected set is: [0-400-200-600-350-650-100-750-150];
- the 6th selected set is: [0-400-200-600-350-650-100-750-175];
- the seventh selected set is: [0-400-200-600-350-650-100-750-225];
- the 8th selected set is: [0-400-200-600-350-650-100-750-250];
- the 9th selected set is: [0-400-200-600-350-650-100-750-275];
- the 10th selected set is: [0-400-200-600-350-650-100-750-300];
- the 11th selected set is: [0-400-200-600-350-650-100-750-325];
- the 12th selected set is: [0-400-200-600-350-650-100-750-375];
- the 13th selected set is: [0-400-200-600-350-650-100-750-425];
- the 14th selected set is: [0-400-200-600-350-650-100-750-450];
- the 15th selected set is: [0-400-200-600-350-650-100-750-475];
- the 16th selected set is: [0-400-200-600-350-650-100-750-500];
- the 17th selected set is: [0-400-200-600-350-650-100-750-525];
- the 18th selected set is: [0-400-200-600-350-650-100-750-550];
- the 19th selected set is: [0-400-200-600-350-650-100-750-575];
- the 20th selected set is: [0-400-200-600-350-650-100-750-625];
- the 21st selected set is: [0-400-200-600-350-650-100-750-675];
- the 22nd selected set is: [0-400-200-600-350-650-100-750-700];
- the 23rd selected set is: [0-400-200-600-350-650-100-750-725];
- the 24th selected set is: [0-400-200-600-350-650-100-750-775].
- the first selected set selected from the M selected sets is: among the M selected sets, the corresponding selected set with the smallest first criterion value. Further, when there are multiple selected sets in the M selected sets with the smallest first criterion value, the first selected set is the selected set with the smallest corresponding first criterion value. The selected set with the smallest two criterion values.
- the first criterion value corresponding to the selected set in this application is the largest off-diagonal element in the correlation matrix corresponding to the selected set; the second criterion value corresponding to the selected set is the correlation matrix corresponding to the selected set.
- the correlation matrix corresponding to the selected set is used to feed back the correlation between the STFs of N-stream spatial streams, where N is the number of elements included in the selected set.
- the correlation matrix corresponding to the selected set is determined according to the signal matrix corresponding to the selected set, the number of rows of the signal matrix is the number of elements included in the selected set, and the number of columns of the signal matrix is non-zero sub
- the number of carriers, the non-zero sub-carriers are the non-zero sub-carriers in the sub-carriers constituting the STF. It should be noted that the non-zero sub-carriers in the sub-carriers constituting the STF do not include sub-carrier 0.
- the number of subcarriers constituting the STF is F
- the index value range of the non-zero subcarriers in the F subcarriers is [-W, W], where W is a positive integer smaller than F.
- the index of the non-zero subcarriers is an integer (except 0) multiple of the interval G, which is related to the system bandwidth, the period of the STF, and the like.
- the number of sub-carriers constituting the STF is 256
- G is equal to 16
- the 256 sub-carriers include 14 non-zero sub-carriers
- the 14 non-zero sub-carriers The indices of the subcarriers are: -112, -96, -80, -64, -48, -32, -16, 16, 32, 48, 64, 80, 96, and 112, respectively.
- the first row element of the signal matrix corresponding to the selected set represents the STF signal on the non-zero subcarrier corresponding to the first stream spatial stream
- the nth row element of the signal matrix represents the nth stream spatial stream corresponding to the STF signal.
- a cyclically shifted STF signal on a non-zero subcarrier, wherein the cyclically shifted STF signal on a nonzero subcarrier corresponding to the nth stream spatial stream is based on the nth element of the selected set and the first stream spatial stream.
- the signal matrix corresponding to the selected set can be expressed as:
- k is the index of the non-zero sub-carrier
- s 1,k is the STF signal on the non-zero sub-carrier k corresponding to the first stream spatial stream
- s n,k is an element in the signal matrix S, representing the nth stream space
- B(n) is the nth element of the selected set
- ⁇ f is the subcarrier spacing
- exp represents the exponential function with the natural constant e as the base.
- the cyclic shift time corresponding to the nth stream spatial stream is the nth element in B(n).
- the STF signal on each non-zero sub-carrier corresponding to the first stream spatial stream can be expressed as:
- the correlation matrix C corresponding to the selected set satisfies the following formula:
- S H is the conjugate transpose matrix of S.
- Each off-diagonal element of the correlation matrix C represents the correlation between the STFs of the two spatial streams.
- the element in the first row and the second column represents the difference between the STF of the first spatial stream and the STF of the second spatial stream.
- the maximum value of its off-diagonal elements is used as the first criterion value of the selected set, and the average value of the off-diagonal elements is used as the second criterion value of the selected set.
- the selected set with the smallest first criterion value among the M selected sets is taken as the first selected set, that is, among the M correlation matrices corresponding to the M selected sets, the first The maximum value of the off-diagonal elements of the correlation matrix corresponding to the selected set is the smallest; further, when there are multiple selected sets corresponding to the minimum first criterion values, the first selected set is the multiple corresponding first criteria In the selected set with the smallest value, the selected set with the smallest second criterion value, that is, in the M correlation matrices corresponding to the M selected sets respectively, the maximum value of the off-diagonal elements of the correlation matrix corresponding to the first selected set is the smallest, and the average value of the off-diagonal elements of the correlation matrix corresponding to the first selected set is the smallest.
- the first selected set can be: 14th selected set: [0-400-200-600-350-650-100-750-450], or, 18th selected set: [0-400-200 -600-350-650-100-750-550].
- the first 9 elements of the CSD sequence are 0, -400, -200, -600, -350, -650, -100, -750, -450, respectively, or, in other words, 9 streams
- the CSD sequence corresponding to the spatial stream is [0-400-200-600-350-650-100-750-450]; in another implementation scenario, the first 9 elements of the CSD sequence are 0, -400, and -200 respectively. , -600, -350, -650, -100, -750, -550, or in other words, the CSD sequence corresponding to the 9-stream spatial stream is [0-400-200-600-350-650-100-750-550] .
- the first selected set is the smallest.
- the set is not unique, so the order of the last L-Y elements of the resulting CSD sequence is not unique.
- the last element of the first selected set is also deleted from the xth candidate set to obtain the x+1th candidate set, so that Make x+1 selection.
- the first selected set selected is [0-400-200-600-350-650-100-750-550] as an example, then -550 is selected from the first candidate Collection [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775 ] to get the second candidate set [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-575-625 -675-700-725-775].
- the second candidate set is: [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-575-625-675- 700-725-775], M equals 23.
- the first selected set is: [0-400-200-600-350-650-100-750-550-25];
- the second selected set is: [0-400-200-600-350-650-100-750-550-50];
- the 22nd selected set is: [0-400-200-600-350-650-100-750-550-700];
- the 23rd selected set is: [0-400-200-600-350-650-100-750-550-725].
- the CSD sequence corresponding to 16 streams can be obtained by the above method: [0-400-200-600-350-650-100-750-550-250-500-150-700-50 -450-300], or, [0-400-200-600-350-650-100-750-450-550-500-150-300-50-250-700].
- the method for selecting the CSD sequence is described only by taking the period of the STF as 800ns, the time interval as -25ns, and L equal to 16 as an example.
- the CSD sequence may also be selected by a method similar to the method in FIG. 9 above.
- the period of STF is 800ns
- the time interval is -12.5ns or -6.25ns
- L is 32
- the period of STF is 800ns
- the time interval is -12.5ns or -6.25ns
- L is 16.
- the time interval is -12.5ns or -6.25ns, and L is 16, compared with the example shown in Figure 9: the time interval is less than 25ns, and the number of elements in the discrete time set is greater than 32. In the case where the number of elements included in the second initial set is still 8, the elements included in the first initial set are greater than 24, and accordingly, the number of candidate sets increases in each selection.
- the selected set with the smallest corresponding first criterion value, or the selected set with the smallest first criterion value and second criterion value is selected as the first 1 of the CSD sequence. elements, so that the correlation between the STFs of the l-stream spatial stream is sufficiently small, thereby reducing the gain setting error of the AGC, and l is less than or equal to L.
- the first initial set is: [-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575- 625-675-700-725-775]
- the second initial set is [0-400-200-600-350-650-100-750], when L is equal to 16, in the optimal case, 9 to 16 spatial streams
- the minimum value of the first criterion value and the minimum value of the second criterion value corresponding to the corresponding CSD sequences are shown in Table 3 below.
- both the CSD sequence 1 and the CSD sequence 2 provided in this application can meet the minimum values shown in Table 3, that is, the first criterion value of the correlation matrix corresponding to the first 1 elements of the CSD sequence 1 and the CSD sequence 2 is equal to the table.
- the minimum value of the first criterion value corresponding to the number of 1-stream spatial streams shown in 3 the second criterion value of the correlation matrix corresponding to the first 1 elements of CSD sequence 1 and CSD sequence 2 is equal to the corresponding number of 1-stream spatial streams shown in Table 3
- the minimum value of the second criterion value of , l 9,10,...,16. That is to say, the CSD sequence 1 and the CSD sequence 2 provided by the present application can make the correlation between the STFs of the respective spatial streams sufficiently small.
- the minimum value of the first criterion value The minimum value of the second criterion value 9 0.1429 0.0564 10 0.1429 0.0571 11 0.1429 0.059 12 0.1429 0.0595 13 0.1429 0.0609 14 0.1429 0.0612 15 0.1429 0.0622 16 0.1429 0.0625
- the 16-stream spatial stream, the channel model B of the 802.11n protocol ie 802.11n-Channel Model B
- the 20 megahertz (MHz) bandwidth the 180-degree phase between the parity antennas
- the cumulative distribution function (CDF) curve of AGC power error using CSD sequence 1 with cyclic shift the cumulative distribution function (CDF) curve of AGC power error without cyclic shift.
- the AGC power error range is 10.75dB without cyclic shift.
- the AGC power error range is 7.57dB. Cyclic shift can reduce the AGC power error range to 7.57dB.
- FIG. 11a it shows the use of CSD sequence 1 under the conditions of 16-stream spatial stream, 802.11n protocol channel model D (ie 802.11n-Channel Model D), 20MHz bandwidth, and 0 degree phase shift between parity antennas CDF curve of AGC power error with cyclic shift, and CDF curve of AGC power without cyclic shift.
- the AGC power error range is 4.85dB.
- the AGC power error range is 3.22dB, that is, under this condition, the CSD sequence 1 is used for Cyclic shift can reduce the AGC power error range to 3.22dB.
- FIG. 11b it shows the use of CSD sequence 1 under the conditions of 16-stream spatial stream, 802.11n protocol channel model D (ie 802.11n-Channel Model B), 80MHz bandwidth, and 0 degree phase shift between parity antennas CDF curve of AGC power error with cyclic shift, and CDF curve of AGC power error without cyclic shift.
- the AGC power error range is 3.75dB when the cyclic shift is not performed.
- the CSD sequence 1 is used for Cyclic shift can reduce the AGC power error range to 2.51dB.
- the second type of CSD sequence is not compatible with the CSD sequence of the second communication protocol.
- the first element of the CSD sequence is 0, and the last 15 elements include: -550, -225, -675, -325, -100, -450, -275, -500 , -50, -725, -600, -375, -150, -575, -475. It should be noted that the order of the last 15 elements of the CSD sequence is not unique.
- the method for determining the second type of CSD sequence is similar to the method shown in FIG. 9 , the difference is that the second initial set is: [0]. That is to say, except for the first element, other elements of the CSD sequence are re-determined according to the method shown in FIG. 9 . For details, reference may be made to the related description shown in FIG. 9 , which will not be repeated here.
- the present application provides a CSD sequence that is not compatible with the 802.11ac protocol or the 802.11ax protocol.
- a criterion value which is smaller than the first criterion value of the correlation matrix corresponding to the first P elements of the CSD sequence of the 802.11ac protocol or 802.11ax protocol.
- the second criterion value of the correlation matrix corresponding to the first P elements of the CSD sequence The criterion value, which is smaller than the second criterion value of the correlation matrix corresponding to the first P elements of the CSD sequence of the 802.11ac protocol or the 802.11ax protocol respectively. That is to say, the CSD sequences that are not compatible with the 802.11ac protocol or the 802.11ax protocol proposed in this application can further reduce the correlation between the STFs of each spatial stream when the number of spatial streams is 2 to 7 streams.
- the methods and/or steps implemented by the first communication device may also be implemented by components (such as chips or circuits) that can be used in the first communication device; and implemented by the second communication device
- the methods and/or steps of the second communication device may also be implemented by components (eg, chips or circuits) that can be used in the second communication device.
- the solution provided by the present application has been introduced above mainly from the perspective of interaction between various devices.
- the present application also provides a communication device, which is used to implement the above-mentioned various methods.
- the communication device may be the first communication device in the foregoing method embodiments, or a device including the foregoing first communication device, or a component usable for the first communication device; or, the communication device may be the first communication device in the foregoing method embodiments
- the second communication device or a device including the second communication device described above, or a component usable for the second communication device.
- the communication apparatus includes corresponding hardware structures and/or software modules for executing each function.
- the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
- the communication device may be divided into functional modules according to the foregoing method embodiments.
- each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
- the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
- FIG. 12 shows a schematic structural diagram of a first communication device 120 .
- the first communication device 120 includes a processing module 1201 and a transceiver module 1202 .
- the first communication device 120 may further include a storage module (not shown in FIG. 12 ) for storing program instructions and data.
- a storage module (not shown in FIG. 12 ) for storing program instructions and data.
- the transceiver module 1202 which may also be referred to as a transceiver unit, is used to implement sending and/or receiving functions.
- the transceiver module 1202 may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
- the first communication apparatus 120 may be the first communication apparatus, or may be a chip applied in the first communication apparatus or other combined devices, components, etc. having the function of the above-mentioned first communication apparatus.
- the transceiver module 1202 may be a transceiver, the transceiver may include an antenna and a radio frequency circuit, etc.
- the processing module 1201 may be a processor (or a processing circuit), such as a baseband processor, One or more CPUs may be included in the baseband processor.
- the transceiver module 1202 may be a radio frequency unit, and the processing module 1201 may be a processor (or a processing circuit), such as a baseband processor.
- the transceiver module 1202 may be an input and output interface of the chip, and the processing module 1201 may be a processor (or a processing circuit) of the chip system, which may include one or more central processing units.
- the transceiver module 1202 may include a receiving module and a sending module, respectively configured to perform the receiving and sending steps performed by the first communication device in the above method embodiments, and/or to support other techniques described herein.
- the processing module 1201 can be used to perform steps of a processing class (eg, determination, acquisition, etc.) performed by the first communication device in the above method embodiments, and/or other processes used to support the techniques described herein.
- the processing module 1201 is used to generate a physical layer protocol data unit PPDU, the PPDU includes a short training field STF, a long training field LTF, and a data field, and the STF, LTF, and data fields are determined according to the cyclic shift diversity CSD sequence.
- the CSD sequence includes L elements, where L is the maximum number of spatial streams supported by the first communication device, and the maximum number of spatial streams is greater than or equal to 16; the transceiver module 1202 is configured to send a PPDU to the second communication device.
- the transceiver module 1202, configured to send the PPDU to the second communication device includes: the transceiver module 1202, configured to send the PPDU to the second communication device through K spatial streams, where K is a positive integer less than or equal to L.
- the first communication apparatus 120 is presented in the form of dividing each functional module in an integrated manner.
- Module herein may refer to a specific ASIC, circuit, processor and memory executing one or more software or firmware programs, integrated logic circuit, and/or other device that may provide the functions described above.
- the first communication device 120 may take the form of the communication device 700 shown in FIG. 7 .
- the processor 701 in the first communication apparatus 700 shown in FIG. 7 may call the computer execution instructions stored in the memory 703 to make the communication apparatus 700 execute the cyclic shift sequence-based communication method in the above method embodiments.
- the functions/implementation process of the processing module 1201 and the transceiver module 1202 in FIG. 12 can be implemented by the processor 701 in the communication apparatus 700 shown in FIG. 7 calling the computer execution instructions stored in the memory 703 .
- the function/implementation process of the processing module 1201 in FIG. 12 can be implemented by the processor 701 in the communication device 700 shown in FIG. 7 calling the computer execution instructions stored in the memory 703, and the function of the transceiver module 1202 in FIG. 12 can be implemented.
- the implementation process can be implemented through the communication interface 704 in the communication device 700 shown in FIG. 7 .
- the first communication device 120 provided in this embodiment can execute the above-mentioned communication method based on a cyclic shift sequence, reference can be made to the above-mentioned method embodiments for technical effects that can be obtained, and details are not repeated here.
- FIG. 13 shows a schematic structural diagram of a second communication device 130 .
- the second communication device 130 includes a processing module 1301 and a transceiver module 1302 .
- the second communication device 130 may further include a storage module (not shown in FIG. 13 ) for storing program instructions and data.
- a storage module (not shown in FIG. 13 ) for storing program instructions and data.
- the transceiver module 1302 which may also be referred to as a transceiver unit, is used to implement sending and/or receiving functions.
- the transceiver module 1302 may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
- the second communication apparatus 130 may be the second communication apparatus, or may be a chip applied in the second communication apparatus or other combined devices, components, etc. having the functions of the second communication apparatus described above.
- the transceiver module 1302 may be a transceiver, the transceiver may include an antenna and a radio frequency circuit, etc.
- the processing module 1301 may be a processor (or a processing circuit), such as a baseband processor, One or more CPUs may be included in the baseband processor.
- the transceiver module 1302 may be a radio frequency unit, and the processing module 1301 may be a processor (or a processing circuit), such as a baseband processor.
- the transceiver module 1302 may be an input and output interface of the chip, and the processing module 1301 may be a processor (or a processing circuit) of the chip system, and may include one or more central processing units.
- the transceiver module 1302 may include a receiving module and a sending module, respectively configured to perform the receiving and sending steps performed by the second communication device in the above method embodiments, and/or to support other techniques described herein.
- the processing module 1301 can be used to perform steps of a processing class (eg, determination, acquisition, etc.) performed by the second communication apparatus in the above method embodiments, and/or other processes used to support the techniques described herein.
- the transceiver module 1302 is configured to receive a physical layer protocol data unit PPDU from the first communication device.
- the PPDU includes a short training field STF, a long training field LTF, and a data field, and the STF, LTF, and data fields are based on the cyclic shift Determined by the bit diversity CSD sequence, the CSD sequence includes L elements, L is the maximum number of spatial streams supported by the first communication device, and the maximum number of spatial streams is greater than or equal to 16; the processing module 1301 is used for processing according to the PPDU.
- the transceiver module 1302, configured to receive the PPDU from the first communication device includes: a transceiver module 1302, configured to receive the PPDU from the first communication device through K spatial streams.
- the second communication apparatus 130 is presented in the form of dividing each functional module in an integrated manner.
- Module herein may refer to a specific ASIC, circuit, processor and memory executing one or more software or firmware programs, integrated logic circuit, and/or other device that may provide the functions described above.
- the second communication device 130 may take the form of the communication device 700 shown in FIG. 7 .
- the processor 701 in the second communication apparatus 700 shown in FIG. 7 may call the computer execution instructions stored in the memory 703 to make the communication apparatus 700 execute the cyclic shift sequence-based communication method in the above method embodiments.
- the functions/implementation process of the processing module 1301 and the transceiver module 1302 in FIG. 13 can be implemented by the processor 701 in the communication apparatus 700 shown in FIG. 7 calling the computer execution instructions stored in the memory 703 .
- the function/implementation process of the processing module 1301 in FIG. 13 can be implemented by the processor 701 in the communication device 700 shown in FIG. 7 calling the computer execution instructions stored in the memory 703, and the function of the transceiver module 1302 in FIG.
- the implementation process can be implemented through the communication interface 704 in the communication device 700 shown in FIG. 7 .
- the second communication device 130 provided in this embodiment can perform the above-mentioned communication method based on a cyclic shift sequence, the technical effect that can be obtained can be referred to the above-mentioned method embodiments, and details are not repeated here.
- an embodiment of the present application further provides a communication apparatus, where the communication apparatus includes a processor for implementing the method in any of the foregoing method embodiments.
- the communication device further includes a memory.
- the memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication apparatus to execute the method in any of the above method embodiments.
- the memory may also not be in the communication device.
- the communication device further includes an interface circuit, which is a code/data read/write interface circuit, and the interface circuit is used to receive computer-executed instructions (the computer-executed instructions are stored in the memory, and may be directly from memory read, or possibly through other devices) and transferred to the processor.
- the communication device further includes a communication interface for communicating with modules outside the communication device.
- the communication device may be a chip or a chip system.
- the communication device may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.
- an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), the communication device includes an interface circuit and a logic circuit, and the interface circuit is used to obtain input information and/or Outputting output information; the logic circuit is configured to execute the method in any of the above method embodiments, and process and/or generate output information according to the input information.
- a communication device for example, the communication device may be a chip or a chip system
- the communication device includes an interface circuit and a logic circuit, and the interface circuit is used to obtain input information and/or Outputting output information; the logic circuit is configured to execute the method in any of the above method embodiments, and process and/or generate output information according to the input information.
- the output information may be a PPDU generated by the first communication apparatus.
- the input information may be a PPDU generated by the first communication device.
- the communication device provided in this embodiment can execute the above-mentioned communication method, so the technical effect that can be obtained may refer to the above-mentioned method embodiment, which is not repeated here.
- the disclosed apparatus and method may be implemented in other manners.
- the device embodiments described above are only illustrative.
- the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods.
- multiple units or components may be Incorporation may either be integrated into another device, or some features may be omitted, or not implemented.
- the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or may be distributed to multiple different places . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
- the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
- the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
- a software program it can be implemented in whole or in part in the form of a computer program product.
- the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated.
- the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
- the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.).
- the computer-readable storage medium can be any available medium that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the medium.
- the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.
- the computer may include the aforementioned apparatus.
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Abstract
本申请提供一种基于循环移位分集序列的通信方法、装置及系统。该方法中,第一通信装置生成并向第二通信装置发送物理层协议数据单元PPDU,该PPDU包括根据循环移位分集CSD序列确定的短训练字段STF、长训练字段LTF、以及数据字段。第二通信装置接收来自第一通信装置的该PPDU后,根据该PPDU进行处理。其中,CSD序列包括L个元素,L为第一通信装置和第二通信装置支持的最大空间流数,该最大空间流数大于或等于16。基于该方案,将最大空间流数扩展至16流及其以上,相比于现有技术的最大8流空间流,能够提高系统容量和频谱效率;此外,基于扩展的最大空间流数,采用相应的CSD序列用于STF、LTF、以及数据字段,能够降低AGC的增益设置误差。
Description
本申请要求于2020年12月24日提交国家知识产权局、申请号为202011573363.6、申请名称为“基于循环移位分集序列的通信方法、装置及系统”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及通信技术领域,尤其涉及基于循环移位分集序列的通信方法、装置及系统。
多输入多输出(multi input multi output,MIMO)技术是无线移动通信领域智能天线技术的重大突破,该技术通过空间复用和空间分集,能够在不增加带宽的情况下成倍地提高通信系统的容量和频谱利用率。在MIMO系统中,发送端和接收端分别使用多个发射天线和接收天线,允许多个发射天线同时发送多个空间流,或允许多个接收天线同时接收多个空间流。
为了大幅提升无线局域网(wireless local access network,WLAN)系统的业务传输速率,电气和电子工程师协会(institute of electrical and electronics engineers,IEEE)在正交频分复用(orthogonal frequency division multiplexing,OFDM)技术的基础上,引入了MIMO技术。
IEEE从802.11n协议开始在WLAN中引入MIMO技术,其支持最大4个空间流。随着通信需求的增加,802.11ac协议将最大空间流数由4流扩展至8流,802.11ax协议继承了802.11ac协议的最大空间流数。
发明内容
本申请提供一种基于循环移位分集序列的通信方法、装置及系统,能够提高系统容量和频谱效率,还能够降低自动增益控制(automatic gain control,AGC)的增益设置误差。
第一方面,本申请提供了一种基于循环移位分集序列的通信方法,该方法可以由第一通信装置执行,也可以由第一通信装置的部件,例如第一通信装置的处理器、芯片、或芯片系统等执行,本申请以第一通信装置执行该方法为例进行说明。该方法包括:第一通信装置生成物理层协议数据单元PPDU,该PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,该STF、该LTF、以及该数据字段是根据循环移位分集CSD序列确定的,该CSD序列包括L个元素,L为该第一通信装置支持的最大空间流数,该最大空间流数大于或等于16;该第一通信装置向第二通信装置发送该PPDU。
基于该方案,一方面,相比于最大8流空间流,可以将最大空间流数扩展至16流,从而适用于通信需求较大,数据量较多的通信场景中,提高系统容量和频谱效率。此外,将空间流限定在16流,相比于将最大空间流数扩展至16流以上,能够降低对接入点或非接入点站点的天线数量的要求,从而降低接入点或非接入点站点的实现复杂度。进一步的,如果已经克服了接入点或非接入点站点的实现复杂度的问题,例如接入点或非接入点能够支持更多的天线数量,且通信需求增加的情况下,可以将最大空间流数扩展至16流以上,例如32流或64流,以便进一步提高系统容量和频谱效率。另一方面,基于本申请扩展的最大空间流数,本申请还采用相应的CSD序列用于STF、LTF、以及数据字段,以降低各个空间流上STF之间的相关性,从而在根据STF的功率进行AGC时,降低AGC的增益设置误差。
在一些可能的设计中,该第一通信装置向该第二通信装置发送该PPDU,包括:该第一通信装置通过K个空间流向该第二通信装置发送该PPDU,K为小于或等于L的正整数。
也就是说,第一通信装置可以采用小于L个空间流发送PPDU。在实际应用中,由于信道环境的复杂多样,并不是空间流数越多,频谱效率或传输性能越高,因此,基于该可能的实现方式,第一通信装置在发送PPDU时,可以根据实际信道条件确定采用小于L个空间流发送PPDU,以尽可能地使频谱效率达到最大。当然,在信道条件较好的情况下,K可以等于L,即第一通信装置通过L个空间流发送PPDU,以使频谱效率最大化。
在一些可能的设计中,该STF、该LTF、以及该数据字段是根据该CSD序列的前K个元素确定的。可以理解的是,该CSD序列的前K个元素分别是K流空间流对应的循环移位值,基于该可能的设计,在通过K个空间流发送PPDU时,使用CSD序列的前K个元素确定STF、LTF、以及数据字段,能够在各流空间流上进行正确的循环移位,从而降低各个空间流的STF之间的相关性。
在一些可能的设计中,L等于16,该CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,该CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
基于该可能的设计,本申请提供的CSD序列的前4个元素为802.11n协议的1至4流的CSD值,前8个元素为802.11ac协议或802.11ax协议的1至8流的CSD值,也就是说,该CSD序列可以兼容802.11n协议、802.11ac协议、或802.11ax协议,有利于系统的平滑演进。此外,在兼容802.11n协议的情况下,若要进行802.11n协议的数据包的发送,或者,在兼容802.11ac/802.11ax协议的情况下,若要进行802.11ac/802.11ax协议的数据包的发送,可以直接采用本申请提供的CSD序列进行循环移位,相比于使用多个标准的CSD序列分别进行相应标准数据包的循环移位,可以降低实现复杂度。
在一些可能的设计中,L等于16,该CSD序列的第一个元素为0,该CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
基于该可能的设计,本申请提供不兼容802.11ac协议或802.11ax协议的CSD序列,经过计算得到,该CSD序列的前P(P=2,3,…,7)个元素分别对应的相关矩阵的第一准则值,小于802.11ac协议或802.11ax协议的CSD序列的前P个元素分别对应的相关矩阵的第一准则值,同样地,该CSD序列的前P个元素分别对应的相关矩阵的第二准则值,小于802.11ac协议或802.11ax协议的CSD序列的前P个元素分别对应的相关矩阵的第二准则值。也就是说,本申请提出的不兼容802.11ac协议或802.11ax协议的CSD序列在空间流数为2至7流时能够进一步降低各个空间流的STF之间的相关性。
第二方面,本申请提供了一种基于循环移位分集序列的通信方法,该方法可以由第二通信装置执行,也可以由第二通信装置的部件,例如第二通信装置的处理器、芯片、或芯片系统等执行,本申请以第二通信装置执行该方法为例进行说明。该方法包括:第二通信装置接收来自第一通信装置的物理层协议数据单元PPDU,该PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,该STF、该LTF、以及该数据字段是根据循环移位分集CSD序列确定的,该CSD序列包括L个元素,L为该第一通信装置支持的最大空间流数,该最大空间流数大于或等于16;该第二通信装置根据该PPDU进行处理。其中,第二方面所带来的技术效果可参考上述第一方面所带来的技术效果,在此不再赘述。
在一些可能的设计中,该第二通信装置接收来自第一通信装置的PPDU,包括:该第二通信装置通过K个空间流接收来自该第一通信装置的该PPDU。
在一些可能的设计中,该STF、该LTF、以及该数据字段是根据该CSD序列的前K个元 素确定的。
在一些可能的设计中,L等于16,该CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,该CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
在一些可能的设计中,L等于16,该CSD序列的第一个元素为0,该CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
其中,第二方面的任一种可能的设计所带来的技术效果可参见上述第一方面相应的设计所带来的技术效果,此处不再赘述。
第三方面,本申请提供了一种通信装置用于实现上述各种方法。该通信装置可以为上述第一方面中的第一通信装置,或者包含上述第一通信装置的装置,或者上述第一通信装置中包含的装置,比如芯片;或者,该通信装置可以为上述第二方面中的第二通信装置,或者包含上述第二通信装置的装置,或者上述第二通信装置中包含的装置,比如芯片。所述通信装置包括实现上述方法相应的模块、单元、或手段(means),该模块、单元、或means可以通过硬件实现,软件实现,或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
在一些可能的设计中,该通信装置可以包括处理模块和收发模块。该收发模块,也可以称为收发单元用以实现上述任一方面及其任意可能的实现方式中的发送和/或接收功能。该收发模块可以由收发电路,收发机,收发器或者通信接口构成。该处理模块,可以用于实现上述任一方面及其任意可能的实现方式中的处理功能。
在一些可能的设计中,收发模块包括发送模块和接收模块,分别用于实现上述任一方面及其任意可能的实现方式中的发送和接收功能。
其中,第三方面提供的通信装置用于执行上述任一方面或任一方面任意可能的实现方式,具体细节可参见上述任一方面或任一方面任意可能的实现方式,此处不再赘述。
第四方面,本申请提供了一种通信装置,包括:处理器和存储器;该存储器用于存储计算机指令,当该处理器执行该指令时,以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一通信装置,或者包含上述第一通信装置的装置,或者上述第一通信装置中包含的装置,比如芯片;或者,该通信装置可以为上述第二方面中的第二通信装置,或者包含上述第二通信装置的装置,或者上述第二通信装置中包含的装置,比如芯片。
第五方面,本申请提供一种通信装置,包括:处理器和通信接口;该通信接口,用于与该通信装置之外的模块通信;所述处理器用于执行计算机程序或指令,以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述第一方面中的第一通信装置,或者包含上述第一通信装置的装置,或者上述第一通信装置中包含的装置,比如芯片;或者,该通信装置可以为上述第二方面中的第二通信装置,或者包含上述第二通信装置的装置,或者上述第二通信装置中包含的装置,比如芯片。
第六方面,本申请提供一种通信装置,包括:接口电路和逻辑电路,该接口电路,用于获取输入信息和/或输出输出信息;该逻辑电路用于执行上述任一方面或任一方面任意可能的实现方式所述的方法,根据输入信息进行处理和/或生成输出信息。
第七方面,本申请提供了一种通信装置,包括:至少一个处理器;所述处理器用于执行存储器中存储的计算机程序或指令,以使该通信装置执行上述任一方面所述的方法。该存储 器可以与处理器耦合,或者,也可以独立于该处理器。该通信装置可以为上述第一方面中的第一通信装置,或者包含上述第一通信装置的装置,或者上述第一通信装置中包含的装置,比如芯片;或者,该通信装置可以为上述第二方面中的第二通信装置,或者包含上述第二通信装置的装置,或者上述第二通信装置中包含的装置,比如芯片。
在一些可能的设计中,该装置是芯片或芯片系统。该装置是芯片系统时,可以由芯片构成,也可以包含芯片和其他分立器件。
第八方面,本申请提供了一种计算机可读存储介质,该计算机可读存储介质中存储有指令,当其在通信装置上运行时,使得通信装置可以执行上述任一方面所述的方法。
第九方面,本申请提供了一种包含指令的计算机程序产品,当其在通信装置上运行时,使得该通信装置可以执行上述任一方面所述的方法。
可以理解的是,第三方面至第九方面中任一方面提供的通信装置是芯片时,上述的发送动作/功能可以理解为输出数据或信息,上述的接收动作/功能可以理解为输入数据或信息。
其中,第三方面至第九方面中任一种设计方式所带来的技术效果可参见上述第一方面或第二方面中不同设计方式所带来的技术效果,在此不再赘述。
第十方面,本申请提供一种通信系统,该通信系统包括上述方面所述的第一通信装置和第二通信装置。
图1为本申请实施例提供的一种PPDU的帧结构示意图一;
图2为本申请实施例提供的一种PPDU的帧结构示意图二;
图3为本申请实施例提供的一种PPDU的帧结构示意图三;
图4为本申请实施例提供的一种PPDU的帧结构示意图四;
图5a为本申请实施例提供的一种通信系统的架构示意图;
图5b为本申请实施例提供的另一种通信系统的架构示意图;
图6为本申请实施例提供的一种接入点和非接入点站点的结构示意图;
图7为本申请实施例提供的一种通信装置的结构示意图;
图8为本申请实施例提供的一种基于CSD序列的通信方法的流程示意图;
图9为本申请实施例提供的一种确定CSD序列的流程示意图;
图10为本申请实施例提供的一种AGC功率误差的对比示意图;
图11a为本申请实施例提供的另一种AGC功率误差的对比示意图;
图11b为本申请实施例提供的又一种AGC功率误差的对比示意图;
图12为本申请实施例提供的一种第一通信装置的结构示意图;
图13为本申请实施例提供的一种第二通信装置的结构示意图。
在本申请的描述中,除非另有说明,“/”表示前后关联的对象是一种“或”的关系,例如,A/B可以表示A或B;本申请中的“和/或”仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况,其中A,B可以是单数或者复数。并且,在本申请的描述中,除非另有说明,“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达,是指的这些项中的任意组合,包括单项(个)或复数项(个)的任意组合。例如,a,b,或c中的至少一项(个),可以表示:a,b,c,a和b,a和c,b和c,a和b和c,其中a,b,c可以是单个,也可以是多个。另外,为了便于清楚描述本申请实施例的技术方案,在本申请的实施例中,采用了“第一”、 “第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定,并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是,本申请中,“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言,使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
为了方便理解本申请实施例的技术方案,首先给出本申请相关技术的简要介绍如下。
1、802.11n标准的PPDU帧结构:
如图1所示,示出了802.11n标准中高吞吐量(high throughput,HT)混合模式的PPDU帧结构。
根据调制方式的不同HT PPDU被分成两个部分。其中,一个是为了与传统帧兼容而设置的部分,称之为pre-HT调制域,该部分包括传统短训练字段(legacy-short training field,L-STF)、传统长训练字段(legacy-long training field,L-LTF)、传统信令字段(legacy-signal field,L-SIG)、以及高吞吐量信令字段(high throughput signal field,HT-SIG)。另一个是采用HT调制的部分,称之为HT域,包括高吞吐量短训练字段(high throughput short training field,HT-STF),高吞吐量长训练字段(high throughput long training field,HT-LTF)、以及数据(Data)字段。
2、802.11ac标准的PPDU帧结构:
如图2所示,示出了802.11ac标准中超高吞吐量(very high throughput,VHT)混合模式的PPDU帧结构。
与802.11n类似,VHT PPDU同样被分为两个部分。其中,一个是与传统帧结构兼容的pre-VHT域,该部分包括L-STF、L-LTF、L-SIG、以及非常高吞吐量信令字段A(very high throughput signal field A,VHT-SIG-A)。另一个是采用VHT调制的部分,称之为VHT域,包括非常高吞吐量短训练字段(very high throughput short training field,VHT-STF)、非常高吞吐量长训练字段(very high throughput long training field,VHT-LTF)、非常高吞吐量信令字段B(very high throughput signal field B,VHT-SIG-B)、以及数据(Data)字段。
3、802.11ax标准的PPDU帧结构:
如图3所示,示出了802.11ax标准中高效率(high efficiency,HE)模式下的PPDU帧结构。
与802.11n类似,HE PPDU同样被分为两个部分。其中,一个是pre-HE域,该部分包括:L-STF、L-LTF、L-SIG、重复传统信令域(repeated legacy-signal field,RL-SIG)、高效信令字段A(high efficient-signal field A,HE-SIG A)、高效信令字段B(high efficient-signal field B,HE-SIG B)。另一个是HE调制域,该部分包括高效短训练域(high efficient-short training field,HE-STF)、高效长训练域(high efficient-long training field,HE-LTF)、数据(data)。可选的,该PPDU还可以包括数据分组扩展(packet extension,PE)。
4、802.11be标准的PPDU帧结构:
如图4所示,示出了802.11be可能采用的极高吞吐率(extremely high throughput,EHT)PPDU的一种帧结构。该EHT PPDU可包括传统前导码(legacy preamble,L-preamble)、高效率前导码(high efficiency preamble,HE-preamble)和物理层聚合服务数据单元(physical layer convergence protocol service data unit,PSDU)三部分。
其中,L-preamble部分包括L-STF字段、L-LTF字段、L-SIG字段;HE-preamble部分包括RL-SIG字段和通用字段(universal SIG,U-SIG)字段、极高吞吐量信令(EHT-SIG)字段、极高吞吐量短训练(extremely high throughtput short training field,EHT-STF)字段、极高吞吐量长训练(extremely high throughtput long training field,EHT-LTF)字段;PSDU部分包括数据(data)字段等字段,其中,U-SIG字段占据2个OFDM符号,如图4中所示的U-SIG SYM1和U-SIG SYM1。其中通用字段(U-SIG)字段可包括版本非相关信息(version independent info)字段和版本相关信息(version dependent info)字段、循环冗余码(cyclic redundancy code,CRC)字段以及尾部字段。该version independent info字段可包含3比特的无线保真(wireless fidelity,WiFi)版本字段,1比特下行/上行字段,至少6比特的BSS color字段,至少7比特的传输机会(transmit opportunity,TXOP)字段。进一步地,该version independent info字段还可以包括带宽字段。version dependent info字段可包括PPDU格式字段等,还可以包括调制编码方案字段,空间流字段,编码字段等字段中的一个或多个。CRC字段至少占用4比特,尾部字段至少占用6比特尾比特字段。
一种可能的实现方式中,EHT-SIG字段包含EHT-SIG公共字段与EHT-SIG用户特定字段,其中,EHT-SIG公共字段可用于承载分配给站点的资源分配信息,EHT-SIG用户特定字段可用于承载用户信息。
应理解,该EHT-PPDU仅为举例,在标准制定过程或技术发展过程中,还可以有其他的结构,本申请不做限定。
为了大幅提升WLAN系统的业务传输速率,IEEE在OFDM技术的基础上,引入了MIMO技术。WLAN-MIMO系统中,PPDU被映射至多个空间流发送,在各个空间流上,STF传输相同的序列,Data字段传输不同的业务数据。对于802.11n设备,接收端参考各个空间流上的HT-STF的功率进行自动增益控制(automatic gain control,AGC)的增益设置,并将此增益用于相应空间流上HT-Data字段的功率调整。对于802.11ac设备,接收端参考各个空间流上的VHT-STF的功率进行AGC的增益设置,并将此增益用于相应空间流上VHT-Data字段的功率调整。对于802.11ax设备,接收端参考各个空间流上的HE-STF的功率进行AGC的增益设置,并将此增益用于相应空间流上HE-Data字段的功率调整。
然而,由于各个空间流上STF传输相同的序列,从接收端来看,经历信道之后的STF序列容易产生不必要的波束成型(beamforming,BF)效应,即不同空间流上的STF在相位相近时正向叠加,在相位相反时反向相消,从整体来看,使得STF的接收功率在较大范围内变化,而Data部分的功率则相对平稳,也就是说,STF与Data字段的功率之比在较大范围内变化,AGC增益设置存在较大的误差。
基于此,发送端在发送PPDU时,对802.11n标准PPDU的HT调制域,或者802.11ac标准PPDU的VHT调制域,或者802.11ax标准PPDU的HE调制域的各个空间流分别进行一定时间的循环移位分集(cyclic shift diversity,CSD),以降低各个空间流的HT-STF之间的相关性,或者降低各个空间流的VHT-STF之间的相关性,或者降低各个空间流的HE-STF之间的相关性。
在采用CSD降低各个空间流的STF之间的相关性时,需要合理设计CSD值,使得各个空间流的STF之间的相关程度足够小。目前,在802.11n标准中定义了1至4流的CSD值,如下表1所示。
表1中,未填写数字的单元格表示相应的CSD值不存在。在空间流数为1时,不进行循环移位;在空间流数为2时,第1流空间流不进行循环移位,第2流空间流对应的循环移位 值为-400ns,即将原始STF的前400ns的信号搬移至STF尾部,同样地,将原始数据字段的前400ns的信号搬移至数据字段的尾部;在空间流数为3时,第1流空间流不进行循环移位,第2流空间流对应的循环移位值为-400ns,第3流空间流对应的循环移位值为-200ns;在空间流数为4时,第1流空间流不进行循环移位,第2流空间流对应的循环移位值为-400ns,第3流空间流对应的循环移位值为-200ns,第4流空间流对应的循环移位值为-600ns。
表1
另外,802.11ac标准中定义了1至8流的CSD值,如下表2所示。其中,相关说明可参考表1的相关描述,在此不再赘述。802.11ax标准沿用了802.11ac标准定义的CSD值,即在802.11ax标准中也采用表2所示的CSD值。
表2
值得注意的是,802.11ac/802.11ax兼容802.11n的CSD值设计,此外,1至7流的CSD值分别是8流CSD值的前1至7个元素。
需要说明的是,本申请中的“空间流”也可以称为“时空流(space-time streams)”,二者可以相互替换,本申请对此不做具体限定。
随着通信需求的增加,目前的8流空间流可能已经无法满足部分通信需求,基于此,本申请提出一种基于CSD序列的通信方法,以将空间流扩展至16流及其以上,以改善频谱效率,另外,提供相应的CSD序列以降低各个空间流的STF之间的干扰,降低增益设置误差。
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行描述。
本申请实施例提供的基于循环移位分集的方法可用于第一通信系统,该第一通信系统为WLAN-MIMO系统,其支持第一通信协议,该第一通信协议是相对于第二通信协议的新式通信协议,示例性的,第一通信协议可以802.11be协议或相对于802.11be协议的新式通信协议,第二通信协议可以是802.11ax、802.11ac、802.11n、802.11g、802.11b、802.11a中的一种或多种。
其中,该第一通信协议定义的最大空间流数为L,L为大于或等于16的正整数。也就是 说,第一通信协议将最大空间流数扩展至16流,或16流以上。可选的,如图5a所示,为本申请提供的第一通信系统50的结构示意图,该第一通信系统50包括至少一个第一通信装置501和至少一个第二通信装置502。
其中,第一通信装置501支持第一通信协议(例如,802.11be协议),也就是说,第一通信装置501支持的最大空间流数为L。进一步地,第一通信装置501还可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN协议。
其中,第二通信装置502支持第一通信协议(例如802.11be协议),也就是说,第二通信装置支持的最大空间流数为L。进一步地,第二通信装置502还可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN协议。
需要说明的是,第一通信装置501支持第一通信协议,也可以理解为:第一通信装置501为第一通信协议设备(device)。同样地,第二通信装置502支持第一通信协议,也可以理解为:第二通信装置502为第一通信协议设备(device)。因此,本申请中的第一通信装置501也可以称为第一通信协议设备501,例如802.11be设备501,第二通信装置502也可以称为第一通信协议设备502,例如802.11be设备502。
可选的,第一通信装置501或第二通信装置502分别包括至少一个隶属的站点(affiliated station,affiliated STA)。其中,隶属的站点可以为接入点站点(access point station STA,AP STA)或非接入点站点(non-access point station,non-AP STA)。为了方便描述,本申请将隶属的站点为AP STA的通信装置称为接入点,将隶属的站点为non-AP STA的通信装置称为非接入点站点。
也就是说,第一通信装置501可以为接入点,相应的,第二通信装置502可以为非接入点站点;或者,第一通信装置501可以为非接入点站点,第二通信装置502为接入点;或者,第一通信装置501和第二通信装置502均为接入点;或者,第一通信装置501和第二通信装置502均为非接入点站点。
具体的,以第一通信装置501和第二通信装置502中的一个为接入点,另一个为非接入点站点为例,该第一通信系统可以如图5b所示。
需要说明的是,在一种实现方式中,non-AP STA可以实现AP的功能,或者说,non-AP STA能够被操作为AP。隶属的站点为可以实现AP功能的non-AP STA或者说能够被操作为AP的non-AP STA的通信装置可以称为软接入点。本申请中的接入点可以包括软接入点,当然,接入点不仅限于软接入点。
可选的,本申请中的接入点可以为移动用户进入有线网络的接入点,主要部署于家庭、大楼内部以及园区内部,典型覆盖半径为几十米至上百米,当然,也可以部署于户外。接入点相当于一个连接有线网和无线网的桥梁,主要作用是将各个无线网络客户端连接到一起,然后将无线网络接入以太网。具体的,接入点可以是带有无线保真(wireless fidelity,WiFi)芯片的终端设备或者网络设备。
其中,接入点可以支持第一通信协议(例如,802.11be协议)。进一步地,接入点还可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN协议。
可选的,本申请中的非接入点站点可以为无线通讯芯片、无线传感器或无线通信终端。例如支持WiFi通讯功能的移动电话、支持WiFi通讯功能的平板电脑、支持WiFi通讯功能的机顶盒、支持WiFi通讯功能的智能电视、支持WiFi通讯功能的智能可穿戴设备、支持WiFi通讯功能的车载通信设备和支持WiFi通讯功能的计算机。
其中,非接入点站点可以支持第一通信协议(例如802.11be协议)。进一步地,非接入点 站点还可以支持802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN协议。
可选的,本申请的接入点可以包括一个或多个天线,即接入点可以是单天线或多天线的设备。同样地,非接入点站点可以包括一个或多个天线,即非接入点站点可以是单天线或多天线的设备。
可选的,如图6所示,示出了接入点和非接入点站点的结构示意图,其中,接入点和站点均包括物理层(physical layer,PHY)和媒体接入控制层(medium access control,MAC),本申请的方案是在PHY和MAC层上的协议设计。可以理解的是,图6可以认为是对接入点和非接入点站点从逻辑功能角度进行的划分。
可选的,具体实现时,第一通信装置501或第二通信装置502可以通过图7中的通信装置来实现。图7所示为本申请提供的通信装置700的硬件结构示意图。该通信装置700包括处理器701,以及至少一个通信接口(图7中仅是示例性的以包括通信接口704为例进行说明)。可选的,该通信装置700还可以包括通信线路702和存储器703。
处理器701可以是一个通用中央处理器(central processing unit,CPU),微处理器,特定应用集成电路(application-specific integrated circuit,ASIC),或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路702可包括一通路,在上述组件之间传送信息。
通信接口704,使用任何收发器一类的装置,用于与其他设备或通信网络通信,如以太网,无线接入网(radio access network,RAN),无线局域网(wireless local area networks,WLAN)等。
存储器703可以是只读存储器(read-only memory,ROM)或可存储静态信息和指令的其他类型的静态存储设备,随机存取存储器(random access memory,RAM)或者可存储信息和指令的其他类型的动态存储设备,也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory,EEPROM)、只读光盘(compact disc read-only memory,CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质,但不限于此。存储器可以是独立存在,通过通信线路702与处理器相连接。存储器也可以和处理器集成在一起。
其中,存储器703用于存储执行本申请方案的计算机执行指令,并由处理器701来控制执行。处理器701用于执行存储器703中存储的计算机执行指令,从而实现本申请下述实施例提供的基于循环移位分集的通信方法。
可选的,本申请实施例中的计算机执行指令也可以称之为应用程序代码或者计算机程序代码,本申请实施例对此不作具体限定。
在具体实现中,作为一种实施例,处理器701可以包括一个或多个CPU,例如图7中的CPU0和CPU1。
在具体实现中,作为一种实施例,通信装置700可以包括多个处理器,例如图7中的处理器701和处理器708。这些处理器中的每一个可以是一个单核(single-CPU)处理器,也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中,作为一种实施例,通信装置700还可以包括输出设备705和输入设备706。输出设备705和处理器701通信,可以以多种方式来显示信息。例如,输出设备705可以是 液晶显示器(liquid crystal display,LCD),发光二极管(light emitting diode,LED)显示设备,阴极射线管(cathode ray tube,CRT)显示设备,或投影仪(projector)等。输入设备706和处理器701通信,可以以多种方式接收用户的输入。例如,输入设备706可以是鼠标、键盘、触摸屏设备或传感设备等。
下面以本申请的方法应用于图5a所示的通信系统为例,结合附图对本申请实施例提供的基于循环移位分集的通信方法进行展开说明。
需要说明的是,本申请下述实施例中各个装置之间的消息名字或消息中各参数的名字等只是一个示例,具体实现中也可以是其他的名字,本申请实施例对此不作具体限定。
如图8所示,为本申请实施例提供的一种基于循环移位分集的通信方法,该方法包括:
S801、第一通信装置生成PPDU。
其中,该PPDU包括短训练字段(short training field,STF)、长训练字段(long training field,LTF)、以及数据(Data)字段。
需要说明的是,本申请下述实施例中除特殊说明外,第一通信装置生成的PPDU为第一通信协议的PPDU,该PPDU包括的STF、LTF分别指非传统STF和非传统LTF。
示例性的,以第一通信协议为802.11be协议为例,第一通信装置生成的PPDU帧结构可以如图4所示,本申请涉及到的该PPDU包括的STF指EHT-STF,该PPDU包括的LTF指EHT-LTF。
其中,该PPDU包括的STF、LTF、以及数据字段是根据CSD序列确定的,该CSD序列包括L个元素。根据前文描述,L为第一通信协议定义的最大空间流数,第一通信装置支持第一通信协议,则L也为第一通信装置支持的最大空间流数,该最大空间流数大于或等于16。
需要说明的是,第一通信装置支持的最大空间流数,也可以理解为:第一通信装置具备收发L个空间流的能力,或者说,第一通信装置有(have)最大L个空间流。
可选的,第一通信装置生成PPDU时,可以根据CSD序列中的第k个元素对第k流空间流对应的原始STF序列、原始LTF序列、以及原始数据序列进行循环移位,分别得到该第k流空间流上传输的STF序列、LTF序列、以及数据序列,该STF序列、LTF序列、以及数据序列分别承载在STF、LTF、以及数据字段。其中,k=1,2,…,K,K为第一通信装置实际采用的空间流数。
S802、第一通信装置向第二通信装置发送PPDU。相应的,第二通信装置接收来自第一通信装置的PPDU。
可选的,第一通信装置通过K个空间流向第二通信装置发送该PPDU。相应的,第二通信装置通过该K个空间流接收来自第二通信装置的PPDU。K为小于或等于L的正整数。
示例性的,通过K个空间流向第二通信装置发送该PPDU时,PPDU的数据部分被分为K个部分,分别在K个空间流上发送。对于PPDU中除数据部分之外的前导部分,本申请不做限定。
也就是说,第一通信装置可以采用小于L个空间流发送PPDU。在实际应用中,由于信道环境的复杂多样,并不是空间流数越多,频谱效率或传输性能越高,因此,基于该方案,第一通信装置在发送PPDU时,可以根据实际信道条件确定采用小于L个空间流发送PPDU,以尽可能地使频谱效率达到最大。当然,在信道条件较好的情况下,K可以等于L,即第一通信装置通过L个空间流发送PPDU,以使频谱效率最大化。
可选的,在第一通信装置通过K个空间流向第二通信装置发送该PPDU时,该PPDU的STF、LTF、以及数据字段是根据CSD序列的前K个元素确定的。即实际使用到的CSD序列 的元素与发送PPDU或映射PPDU的空间流数相关。
可选的,第二通信装置在接收PPDU时,可以根据各个空间流的STF的功率,进行AGC的增益设置,并将该增益用于相应空间流上数据字段的功率调整。由于本申请的第一通信装置采用了CSD序列用于STF、LTF、以及数据字段,因此第二通信装置在根据STF的功率进行数据字段的功率调整时,误差较低。
S803、第二通信装置根据PPDU进行处理。
可选的,第二通信装置可以根据PPDU数据字段承载的数据进行业务处理,本申请对此不做具体限定。
基于该方案,一方面,相比于最大8流空间流,可以将最大空间流数扩展至16流,从而适用于通信需求较大,数据量较多的通信场景中,提高系统容量和频谱效率。此外,将空间流限定在16流,相比于将最大空间流数扩展至16流以上,能够降低对接入点或非接入点站点的天线数量的要求,从而降低接入点或非接入点站点的实现复杂度。进一步的,如果已经克服了接入点或非接入点站点的实现复杂度的问题,例如接入点或非接入点能够支持更多的天线数量,且通信需求增加的情况下,可以将最大空间流数扩展至16流以上,例如32流或64流,以便进一步提高系统容量和频谱效率。另一方面,基于本申请扩展的最大空间流数,本申请还采用相应的CSD序列用于STF、LTF、以及数据字段,以降低各个空间流上STF之间的相关性,从而在根据STF的功率进行AGC时,降低AGC的增益设置误差。
以上,为本申请提供的基于CSD序列的通信方法流程,下面,对本申请提供的该CSD序列进行详细介绍。
其中,在L等于16,即最大空间流数为16流时,本申请提供两类可能的CSD序列:
一种可能的实现方式中,本申请提供的第一类CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,该CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
需要说明的是,本申请仅限定该CSD序列的后8个元素包括-550、-250、-500、-150、-700、-50、-450、-300,该8个元素在CSD序列中的顺序不唯一。
示例性的,一种可能的情况下,该CSD序列可以为:
[0-400-200-600-350-650-100-750-550-250-500-150-700-50-450-300](记为CSD序列1)。
或者,另一种可能的情况下,该CSD序列可以为:
[0-400-200-600-350-650-100-750-450-550-500-150-300-50-250-700](记为CSD序列2)。
需要说明的是,本申请中,第l流空间流对应的CSD值为该CSD序列中的第l个元素,l为小于或等于L的正整数;或者说,总的空间流数为l时,该l流对应的CSD序列由本申请提供的16流对应的CSD序列的前l个元素构成。
可选的,该CSD序列中元素的单位为ns。随着通信技术的发展或演进,该CSD序列中元素的单位可以为其他时间单位,例如微秒(microsecond,μs),本申请对此不做具体限定。
基于该可能的实现方式,本申请提供的CSD序列的前4个元素为802.11n协议的1至4流的CSD值,前8个元素为802.11ac协议或802.11ax协议的1至8流的CSD值,也就是说,该CSD序列可以兼容802.11n协议、802.11ac协议、或802.11ax协议,有利于系统的平滑演进。此外,在兼容802.11n协议的情况下,若要进行802.11n协议的数据包的发送,或者,在兼容802.11ac/802.11ax协议的情况下,若要进行802.11ac/802.11ax协议的数据包的发送,可 以直接采用本申请提供的CSD序列进行循环移位,相比于使用多个标准的CSD序列分别进行相应标准数据包的循环移位,可以降低实现复杂度。
下面提供一种CSD序列的确定方法,根据该方法可以确定出上述16流对应的CSD序列。当然,本申请上述提供的16流对应的CSD序列也可以通过其他方法确定得到,本申请对此不做具体限定。
如图9所示,本申请提供的CSD序列的确定方法,可以包括如下步骤:
S901、确定离散时间集合。
可选的,该离散时间集合的范围是根据STF的周期确定的。示例性的,该离散时间集合中的最大元素小于或等于STF的周期。
可选的,该离散时间集合中任意两个相邻元素之间的时间间隔相等,STF的周期除以该时间间隔的商即为该离散时间集合包括的元素个数。基于此,离散时间集合中的元素均为该时间间隔的倍数。
需要说明的是,本申请中,该离散集合包括的元素个数是最大空间流数L的Q倍,Q为大于或等于2的正整数。
示例性的,假设STF的周期为800ns,则离散时间集合的范围为[0,-800),若时间间隔为-25ns,则该离散时间集合为:[0-25-50-75-100-125-150-175-200-225-250-275-300-325-350-375-400-425-450-475-500-525-550-575-600-625-650-675-700-725-750-775]。
可以理解的是,该示例中,时间间隔还可以为其他值,例如-12.5ns,-6.25ns等,本申请对此不做具体限定。
S902、确定第一初始集合和第二初始集合。
其中,第二初始集合包括离散时间集合的Y个元素,第一初始集合包括离散时间集合中除该Y个元素之外的元素。
进一步的,该第二初始集合包括的Y个元素组成第二通信协议定义的CSD序列。示例性的,以第二通信协议为802.11ac协议或802.11ax协议为例,Y等于8,第二初始集合为:[0-400-200-600-350-650-100-750]。
则基于步骤S901中示例的离散时间集合,第一初始集合为:[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775]。
S903、根据第一初始集合和第二初始集合进行X次选择,得到CSD序列。
其中,该CSD序列的前Y个元素为构成第二初始集合的Y个元素,X等于L-Y。示例性的,L等于16,Y等于8为例,则X等于8,即根据第一初始集合和第二初始集合进行8次选择。
可选的,在第x次选择中:
首先,将第x个备选集合的第m个元素添加至该CSD序列的前Y+x-1个元素,得到第m个已选集合,m=1,2,…,M,M为第x个备选集合包括的元素个数,备选集合为第一初始集合的子集,x=1,2,…,X。
其次,从该M个已选集合中选出第一已选集合,将构成第一已选集合的元素作为该CSD序列的前Y+x个元素。
需要说明的是,在x等于1时,第x个备选集合,即第1个备选集合为第一初始集合。
示例性的,以第一初始集合为:[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775],第二初始集合为[0-400-200-600-350-650-100-750]为例:
在第1次选择中:
第1个备选集合为:[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775],M等于24。
CSD序列的前Y+x-1=8个元素分别为:0-400-200-600-350-650-100-750。
将第1个备选集合的M个元素分别添加至CSD序列的前8个元素之后,也就是第二初始集合中新增第一备选集合的M个元素中的一个,得到的M个已选集合如下:
第1个已选集合为:[0-400-200-600-350-650-100-750-25];
第2个已选集合为:[0-400-200-600-350-650-100-750-50];
第3个已选集合为:[0-400-200-600-350-650-100-750-75];
第4个已选集合为:[0-400-200-600-350-650-100-750-125];
第5个已选集合为:[0-400-200-600-350-650-100-750-150];
第6个已选集合为:[0-400-200-600-350-650-100-750-175];
第7个已选集合为:[0-400-200-600-350-650-100-750-225];
第8个已选集合为:[0-400-200-600-350-650-100-750-250];
第9个已选集合为:[0-400-200-600-350-650-100-750-275];
第10个已选集合为:[0-400-200-600-350-650-100-750-300];
第11个已选集合为:[0-400-200-600-350-650-100-750-325];
第12个已选集合为:[0-400-200-600-350-650-100-750-375];
第13个已选集合为:[0-400-200-600-350-650-100-750-425];
第14个已选集合为:[0-400-200-600-350-650-100-750-450];
第15个已选集合为:[0-400-200-600-350-650-100-750-475];
第16个已选集合为:[0-400-200-600-350-650-100-750-500];
第17个已选集合为:[0-400-200-600-350-650-100-750-525];
第18个已选集合为:[0-400-200-600-350-650-100-750-550];
第19个已选集合为:[0-400-200-600-350-650-100-750-575];
第20个已选集合为:[0-400-200-600-350-650-100-750-625];
第21个已选集合为:[0-400-200-600-350-650-100-750-675];
第22个已选集合为:[0-400-200-600-350-650-100-750-700];
第23个已选集合为:[0-400-200-600-350-650-100-750-725];
第24个已选集合为:[0-400-200-600-350-650-100-750-775]。
其中,从该M个已选集合中选出的第一已选集合为:该M个已选集合中,对应的第一准则值最小的已选集合。进一步地,在该M个已选集合中存在多个已选集合对应的第一准则值最小时,该第一已选集合为该多个对应的第一准则值最小的已选集合中,第二准则值最小的已选集合。
可选的,本申请中已选集合对应的第一准则值为该已选集合对应的相关矩阵中最大的非对角元素;已选集合对应的第二准则值为该已选集合对应的相关矩阵中非对角元素的平均值。该已选集合对应的相关矩阵用于反馈N流空间流的STF之间的相关性,N为该已选集合包括的元素个数。
可选的,已选集合对应的相关矩阵是根据该已选集合对应的信号矩阵确定的,该信号矩阵的行数为该已选集合包括的元素个数,该信号矩阵的列数是非零子载波的个数,该非零子载波是构成STF的子载波中的非零子载波。需要注意的是,构成STF的子载波中的非零子载 波不包括子载波0。
示例性的,假设构成STF的子载波的个数为F,该F个子载波中的非零子载波的索引取值范围为[-W,W],W为小于F的正整数。此外,非零子载波的索引为间隔G的整数(0除外)倍,该间隔G与系统带宽、STF的周期等相关。
示例性的,以系统带宽为20兆赫兹(megahertz,MHz)为例,构成STF的子载波个数为256,G等于16,该256个子载波包括14个非零子载波,该14个非零子载波的索引分别为:-112,-96,-80,-64,-48,-32,-16,16,32,48,64,80,96,112。
可选的,该已选集合对应的信号矩阵的第一行元素表示第一流空间流对应的非零子载波上的STF信号,该信号矩阵的第n行的元素表示第n流空间流对应的非零子载波上的循环移位STF信号,其中,第n流空间流对应的非零子载波上的循环移位STF信号是根据该已选集合的第n个元素和第一流空间流对应的非零子载波上的STF信号确定的,n=2,3,…,N,N为已选集合包括的元素个数。
具体的,该已选集合对应的信号矩阵可以表示为:
其中:
s
n,k=s
1,k·exp(-j2πk·Δf·B(n))
其中,k为非零子载波的索引,s
1,k为第一流空间流对应的非零子载波k上的STF信号,s
n,k为信号矩阵S中的一个元素,表示第n流空间流对应的非零子载波k上的循环移位STF信号,B(n)为已选集合的第n个元素,Δf为子载波间隔,exp表示以自然常数e为底的指数函数。
可以理解的是,第n流空间流对应的循环移位时间为B(n)中的第n个元素。
示例性的,以构成STF的子载波个数为256,包括14个非零子载波为例,第一流空间流对应的各个非零子载波上的STF信号可以表示为:
其中,j为虚数单位。
可选的,基于上述已选集合对应的信号矩阵S,该已选集合对应的相关矩阵C满足如下公式:
C=S*S
H
其中,S
H为S的共轭转置矩阵。相关矩阵C的每个非对角元素表示两流空间流的STF之间的相关性,例如,第1行第2列的元素表示第1流空间流的STF与第2流空间流的STF之间的相关性,或者说,表示第1流空间流的STF对第2流空间流的STF的影响。
基于上述已选集合对应的相关矩阵C,其非对角元素的最大值作为已选集合的第一准则值,非对角元素的平均值作为已选集合的第二准则值。
基于此,在x次选择中,M个已选集合中对应的第一准则值最小的已选集合作为第一已选集合,即M个已选集合分别对应的M个相关矩阵中,第一已选集合对应的相关矩阵的非对角元素的最大值最小;进一步地,存在多个已选集合对应的第一准则值最小时,该第一已选集合为该多个对应的第一准则值最小的已选集合中,第二准则值最小的已选集合,即M个已选集合分别对应的M个相关矩阵中,第一已选集合对应的相关矩阵的非对角元素的最大值 最小,且第一已选集合对应的相关矩阵的非对角元素的平均值最小。
也就是说,在第x选择中,选择对应的第一准则值最小,或者对应的第一准则和第二准则值均最小的已选集合,将组成该已选集合的元素作为CSD序列的前Y+x-1个元素。
示例性的,以第1次选择得到的前述列举的24个已选集合为例,分别根据过程计算每个已选集合对应的第一准则值和第二准则值可得第1次选择对应的第一已选集合可以为:第14个已选集合:[0-400-200-600-350-650-100-750-450],或者,第18个已选集合:[0-400-200-600-350-650-100-750-550]。
也就是说,一种实施场景下,CSD序列的前9个元素分别为0、-400、-200、-600、-350、-650、-100、-750、-450,或者说,9流空间流对应的CSD序列为[0-400-200-600-350-650-100-750-450];另一种实施场景下,CSD序列的前9个元素分别为0、-400、-200、-600、-350、-650、-100、-750、-550,或者说,9流空间流对应的CSD序列为[0-400-200-600-350-650-100-750-550]。
需要说明的是,在一次选择过程中,可能存在多个已选集合对应的第一准则值最小,且该多个已选集合对应的第二准则值也最小,该情况下,第一已选集合不唯一,从而,最终得到的CSD序列的后L-Y个元素的顺序也不唯一。
可选的,在第x次选择中得到第一已选集合后,还将第一已选集合的最后一个元素从第x个备选集合中删除,得到第x+1个备选集合,以便进行第x+1次选择。
示例性的,以x等于1时,选择的第一已选集合为[0-400-200-600-350-650-100-750-550]为例,则将-550从第1个备选集合[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775]中删除,得到第2个备选集合[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-575-625-675-700-725-775]。
从而,在第2次选择中:
第2个备选集合为:[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-575-625-675-700-725-775],M等于23。
CSD序列的前Y+x-1=9个元素分别为:0-400-200-600-350-650-100-750-550。
将第2个备选集合的M个元素分别添加至CSD序列的前9个元素,得到的M个已选集合如下:
第1个已选集合为:[0-400-200-600-350-650-100-750-550-25];
第2个已选集合为:[0-400-200-600-350-650-100-750-550-50];
……
第22个已选集合为:[0-400-200-600-350-650-100-750-550-700];
第23个已选集合为:[0-400-200-600-350-650-100-750-550-725]。
之后,计算该23个已选集合对应的第一准则值和第二准则值,选择该23个已选集合中的第一已选集合,得到CSD序列的前10个元素,或者说,得到10流空间流对应的CSD序列。接下来,重复上述过程直至得到CSD序列的第L个元素,或者说,直至CSD序列包括L个元素。
示例性的,在L等于16时,通过上述方法可以得到16流对应的CSD序列:[0-400-200-600-350-650-100-750-550-250-500-150-700-50-450-300],或者,[0-400-200-600-350-650-100-750-450-550-500-150-300-50-250-700]。
可以理解的是,本申请上述实施例仅以STF的周期为800ns,时间间隔为-25ns,L等于 16为例对选择CSD序列的方法进行了说明。当然,STF的周期、时间间隔、L中的一项或多项为其他值时,也可采用类似上述图9的方法选择CSD序列。例如STF的周期为800ns,时间间隔为-12.5ns或-6.25ns,L为32,或者,STF的周期为800ns,时间间隔为-12.5ns或-6.25ns,L为16。
示例性的,在STF的周期为800ns,时间间隔为-12.5ns或-6.25ns,L为16时,与图9所示的示例相比:时间间隔小于25ns,离散时间集合中的元素数量大于32,在第二初始集合包括的元素数仍然为8的情况下,第一初始集合包括的元素大于24,相应的,在每次选择中备选集合的数量增加。
综上,基于图9所示的方法,在每次选择过程中,均选择对应的第一准则值最小,或第一准则值和第二准则值均最小的已选集合作为CSD序列的前l个元素,从而使得l流空间流的STF之间的相关性足够小,进而降低AGC的增益设置误差,l小于或等于L。
示例性的,第一初始集合为:[-25-50-75-125-150-175-225-250-275-300-325-375-425-450-475-500-525-550-575-625-675-700-725-775],第二初始集合为[0-400-200-600-350-650-100-750],L等于16时,最优情况下,9至16流空间流对应的CSD序列所分别对应的第一准则值的最小值和第二准则值的最小值如下表3所示。经计算,本申请上述提供的CSD序列1和CSD序列2均可满足表3所示的最小值,即CSD序列1和CSD序列2的前l个元素对应的相关矩阵的第一准则值等于表3所示l流空间流数对应的第一准则值的最小值,CSD序列1和CSD序列2的前l个元素对应的相关矩阵的第二准则值等于表3所示l流空间流数对应的第二准则值的最小值,l=9,10,...,16。也就是说,本申请提供的CSD序列1和CSD序列2能够使得各个空间流的STF之间的相关性足够小。
表3
空间流数 | 第一准则值的最小值 | 第二准则值的最小值 |
9 | 0.1429 | 0.0564 |
10 | 0.1429 | 0.0571 |
11 | 0.1429 | 0.059 |
12 | 0.1429 | 0.0595 |
13 | 0.1429 | 0.0609 |
14 | 0.1429 | 0.0612 |
15 | 0.1429 | 0.0622 |
16 | 0.1429 | 0.0625 |
此外,如图10所示,示出了在16流空间流、802.11n协议的信道模型B(即802.11n-Channel Model B)、20兆赫兹(megahertz,MHz)带宽、奇偶天线间180度相移的条件下,使用CSD序列1进行循环移位的AGC功率误差的累积分布函数(cumulative distribution function,CDF)曲线,以及不进行循环移位时的AGC功率误差的CDF曲线。由图10可得,在不进行循环移位时,AGC功率误差范围为10.75dB,使用CSD序列1进行循环移位后,AGC功率误差范围为7.57dB,即该条件下,使用CSD序列1进行循环移位可以使得AGC功率误差范围缩小至7.57dB。
如图11a所示,示出了在16流空间流、802.11n协议的信道模型D(即802.11n-Channel Model D)、20MHz带宽、奇偶天线间0度相移的条件下,使用CSD序列1进行循环移位的AGC功率误差的CDF曲线,以及不进行循环移位时的AGC功率的CDF曲线。由图11a可 得,在不进行循环移位时,AGC功率误差范围为4.85dB,使用CSD序列1进行循环移位后,AGC功率误差范围为3.22dB,即该条件下,使用CSD序列1进行循环移位可以使得AGC功率误差范围缩小至3.22dB。
如图11b所示,示出了在16流空间流、802.11n协议的信道模型D(即802.11n-Channel Model B)、80MHz带宽、奇偶天线间0度相移的条件下,使用CSD序列1进行循环移位的AGC功率误差的CDF曲线,以及不进行循环移位时的AGC功率误差的CDF曲线。由图11b可得,在不进行循环移位时,AGC功率误差范围为3.75dB,使用CSD序列1进行循环移位后,AGC功率误差范围为2.51dB,即该条件下,使用CSD序列1进行循环移位可以使得AGC功率误差范围缩小至2.51dB。
以上,介绍了本申请提供的第一类CSD序列,下面对本申请提供的第二类CSD序列进行介绍。
其中,该第二类CSD序列不兼容第二通信协议的CSD序列。示例性的,在L等于16时,该CSD序列的第一个元素为0,后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。需要说明的是,该CSD序列的后15个元素的顺序不唯一。
可选的,该第二类CSD序列的确定方法与图9所示的方法类似,区别在于,第二初始集合为:[0]。也就是说,除第一个元素外,该CSD序列的其他元素均按照图9所示的方法重新确定,具体可参考图9所示的相关描述,在此不再赘述。
基于该方案,本申请提供不兼容802.11ac协议或802.11ax协议的CSD序列,经过计算得到,该CSD序列的前P(P=2,3,…,7)个元素分别对应的相关矩阵的第一准则值,小于802.11ac协议或802.11ax协议的CSD序列的前P个元素分别对应的相关矩阵的第一准则值,同样地,该CSD序列的前P个元素分别对应的相关矩阵的第二准则值,小于802.11ac协议或802.11ax协议的CSD序列的前P个元素分别对应的相关矩阵的第二准则值。也就是说,本申请提出的不兼容802.11ac协议或802.11ax协议的CSD序列在空间流数为2至7流时能够进一步降低各个空间流的STF之间的相关性。
在本申请的各个实施例中,如果没有特殊说明以及逻辑冲突,不同的实施例之间的术语和/或描述具有一致性、且可以相互引用,不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
可以理解的是,以上各个实施例中,由第一通信装置实现的方法和/或步骤,也可以由可用于该第一通信装置的部件(例如芯片或者电路)实现;由第二通信装置实现的方法和/或步骤,也可以有可用于该第二通信装置的部件(例如芯片或者电路)实现。
上述主要从各个设备之间交互的角度对本申请提供的方案进行了介绍。相应的,本申请还提供了通信装置,该通信装置用于实现上述各种方法。该通信装置可以为上述方法实施例中的第一通信装置,或者包含上述第一通信装置的装置,或者为可用于第一通信装置的部件;或者,该通信装置可以为上述方法实施例中的第二通信装置,或者包含上述第二通信装置的装置,或者为可用于第二通信装置的部件。
可以理解的是,该通信装置为了实现上述功能,其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种 实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法实施例对通信装置进行功能模块的划分,例如,可以对应各个功能划分各个功能模块,也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现,也可以采用软件功能模块的形式实现。需要说明的是,本申请实施例中对模块的划分是示意性的,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式。
比如,以通信装置为上述方法实施例中的第一通信装置为例,图12示出了一种第一通信装置120的结构示意图。该第一通信装置120包括处理模块1201和收发模块1202。
可选的,该第一通信装置120还可以包括存储模块(图12中未示出),用于存储程序指令和数据。
可选的,收发模块1202,也可以称为收发单元用以实现发送和/或接收功能。该收发模块1202可以由收发电路,收发机,收发器或者通信接口构成。
示例性地,第一通信装置120可以是第一通信装置,也可以是应用于第一通信装置中的芯片或者其他具有上述第一通信装置功能的组合器件、部件等。当第一通信装置120是第一通信装置时,收发模块1202可以是收发器,收发器可以包括天线和射频电路等,处理模块1201可以是处理器(或者,处理电路),例如基带处理器,基带处理器中可以包括一个或多个CPU。当第一通信装置120是具有上述第一通信装置功能的部件时,收发模块1202可以是射频单元,处理模块1201可以是处理器(或者,处理电路),例如基带处理器。当第一通信装置120是芯片系统时,收发模块1202可以是芯片的输入输出接口,处理模块1201可以是芯片系统的处理器(或者,处理电路),可以包括一个或多个中央处理单元。
例如,收发模块1202,可以包括接收模块和发送模块,分别用于执行上述方法实施例中由第一通信装置执行的接收和发送类的步骤,和/或用于支持本文所描述的技术的其它过程;处理模块1201,可以用于执行上述方法实施例中由第一通信装置执行的处理类(例如确定、获取等)的步骤,和/或用于支持本文所描述的技术的其它过程。
具体的,处理模块1201,用于生成物理层协议数据单元PPDU,PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,STF、LTF、以及数据字段是根据循环移位分集CSD序列确定的,CSD序列包括L个元素,L为第一通信装置支持的最大空间流数,最大空间流数大于或等于16;收发模块1202,用于向第二通信装置发送PPDU。
可选的,收发模块1202,用于向第二通信装置发送PPDU,包括:收发模块1202,用于通过K个空间流向第二通信装置发送PPDU,K为小于或等于L的正整数。
其中,上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述,在此不再赘述。
在本实施例中,该第一通信装置120以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC,电路,执行一个或多个软件或固件程序的处理器和存储器,集成逻辑电路,和/或其他可以提供上述功能的器件。在一个简单的实施例中,本领域的技术人员可以想到该第一通信装置120可以采用图7所示的通信装置700的形式。
比如,图7所示的第一通信装置700中的处理器701可以通过调用存储器703中存储的计算机执行指令,使得通信装置700执行上述方法实施例中的基于循环移位序列的通信方法。
具体的,图12中的处理模块1201和收发模块1202的功能/实现过程可以通过图7所示的通信装置700中的处理器701调用存储器703中存储的计算机执行指令来实现。或者,图12中的处理模块1201的功能/实现过程可以通过图7所示的通信装置700中的处理器701调 用存储器703中存储的计算机执行指令来实现,图12中的收发模块1202的功能/实现过程可以通过图7所示的通信装置700中的通信接口704来实现。
由于本实施例提供的第一通信装置120可执行上述基于循环移位序列的通信方法,因此其所能获得的技术效果可参考上述方法实施例,在此不再赘述。
比如,以通信装置为上述方法实施例中的第二通信装置为例,图13示出了一种第二通信装置130的结构示意图。该第二通信装置130包括处理模块1301和收发模块1302。
可选的,该第二通信装置130还可以包括存储模块(图13中未示出),用于存储程序指令和数据。
可选的,收发模块1302,也可以称为收发单元用以实现发送和/或接收功能。该收发模块1302可以由收发电路,收发机,收发器或者通信接口构成。
示例性地,第二通信装置130可以是第二通信装置,也可以是应用于第二通信装置中的芯片或者其他具有上述第二通信装置功能的组合器件、部件等。当第二通信装置130是第二通信装置时,收发模块1302可以是收发器,收发器可以包括天线和射频电路等,处理模块1301可以是处理器(或者,处理电路),例如基带处理器,基带处理器中可以包括一个或多个CPU。当第二通信装置130是具有上述第二通信装置功能的部件时,收发模块1302可以是射频单元,处理模块1301可以是处理器(或者,处理电路),例如基带处理器。当第二通信装置130是芯片系统时,收发模块1302可以是芯片的输入输出接口,处理模块1301可以是芯片系统的处理器(或者,处理电路),可以包括一个或多个中央处理单元。
例如,收发模块1302,可以包括接收模块和发送模块,分别用于执行上述方法实施例中由第二通信装置执行的接收和发送类的步骤,和/或用于支持本文所描述的技术的其它过程;处理模块1301,可以用于执行上述方法实施例中由第二通信装置执行的处理类(例如确定、获取等)的步骤,和/或用于支持本文所描述的技术的其它过程。
具体的,收发模块1302,用于接收来自第一通信装置的物理层协议数据单元PPDU,PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,STF、LTF、以及数据字段是根据循环移位分集CSD序列确定的,CSD序列包括L个元素,L为第一通信装置支持的最大空间流数,最大空间流数大于或等于16;处理模块1301,用于根据PPDU进行处理。
可选的,收发模块1302,用于接收来自第一通信装置的PPDU,包括:收发模块1302,用于通过K个空间流接收来自第一通信装置的PPDU。
其中,上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述,在此不再赘述。
在本实施例中,该第二通信装置130以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC,电路,执行一个或多个软件或固件程序的处理器和存储器,集成逻辑电路,和/或其他可以提供上述功能的器件。在一个简单的实施例中,本领域的技术人员可以想到该第二通信装置130可以采用图7所示的通信装置700的形式。
比如,图7所示的第二通信装置700中的处理器701可以通过调用存储器703中存储的计算机执行指令,使得通信装置700执行上述方法实施例中的基于循环移位序列的通信方法。
具体的,图13中的处理模块1301和收发模块1302的功能/实现过程可以通过图7所示的通信装置700中的处理器701调用存储器703中存储的计算机执行指令来实现。或者,图13中的处理模块1301的功能/实现过程可以通过图7所示的通信装置700中的处理器701调用存储器703中存储的计算机执行指令来实现,图13中的收发模块1302的功能/实现过程可以通过图7所示的通信装置700中的通信接口704来实现。
由于本实施例提供的第二通信装置130可执行上述基于循环移位序列的通信方法,因此其所能获得的技术效果可参考上述方法实施例,在此不再赘述。
可选的,本申请实施例还提供了一种通信装置,该通信装置包括处理器,用于实现上述任一方法实施例中的方法。在一种可能的设计中,该通信装置还包括存储器。该存储器,用于保存必要的程序指令和数据,处理器可以调用存储器中存储的程序代码以指令该通信装置执行上述任一方法实施例中的方法。当然,存储器也可以不在该通信装置中。在另一种可能的设计中,该通信装置还包括接口电路,该接口电路为代码/数据读写接口电路,该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中,可能直接从存储器读取,或可能经过其他器件)并传输至该处理器。在又一种可能的设计中,该通信装置还包括通信接口,该通信接口用于与该通信装置之外的模块通信。该通信装置可以是芯片或芯片系统,该通信装置是芯片系统时,可以由芯片构成,也可以包含芯片和其他分立器件,本申请实施例对此不作具体限定。
可选的,本申请实施例还提供了一种通信装置(例如,该通信装置可以是芯片或芯片系统),该通信装置包括接口电路和逻辑电路,该接口电路用于获取输入信息和/或输出输出信息;该逻辑电路,用于执行上述任一方法实施例中的方法,根据输入信息进行处理和/或生成输出信息。
当该通信装置用于实现上述方法实施例中的第一通信装置的功能时:输出信息可以为第一通信装置生成的PPDU。当该通信装置用于实现上述方法实施例中的第二通信装置的功能时:输入信息可以为第一通信装置生成的PPDU。
其中,本实施例提供的通信装置可执行上述的通信方法,因此其所能获得的技术效果可参考上述方法实施例,在此不再赘述。
通过以上的实施方式的描述,所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,仅以上述各功能模块的划分进行举例说明,实际应用中,可以根据需要而将上述功能分配由不同的功能模块完成,即将装置的内部结构划分成不同的功能模块,以完成以上描述的全部或者部分功能。
在本申请所提供的几个实施例中,应该理解到,所揭露的装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述模块或单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个装置,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是一个物理单元或多个物理单元,即可以位于一个地方,或者也可以分布到多个不同地方。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。
在上述实施例中,可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时,可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时,全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算 机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中,或者从一个计算机可读存储介质向另一个计算机可读存储介质传输,例如,所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line,DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如,软盘、硬盘、磁带),光介质(例如,DVD)、或者半导体介质(例如固态硬盘(solid state disk,SSD))等。本申请实施例中,计算机可以包括前面所述的装置。
尽管在此结合各实施例对本申请进行了描述,然而,在实施所要求保护的本申请过程中,本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书,可理解并实现所述公开实施例的其他变化。在权利要求中,“包括”(comprising)一词不排除其他组成部分或步骤,“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施,但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述,显而易见的,在不脱离本申请的精神和范围的情况下,可对其进行各种修改和组合。相应地,本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明,且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然,本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样,倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
Claims (26)
- 一种基于循环移位分集序列的通信方法,其特征在于,所述方法包括:第一通信装置生成物理层协议数据单元PPDU,所述PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,所述STF、所述LTF、以及所述数据字段是根据循环移位分集CSD序列确定的,所述CSD序列包括L个元素,L为所述第一通信装置支持的最大空间流数,所述最大空间流数大于或等于16;所述第一通信装置向第二通信装置发送所述PPDU。
- 根据权利要求1所述的方法,其特征在于,所述第一通信装置向所述第二通信装置发送所述PPDU,包括:所述第一通信装置通过K个空间流向所述第二通信装置发送所述PPDU,K为小于或等于L的正整数。
- 根据权利要求2所述的方法,其特征在于,所述STF、所述LTF、以及所述数据字段是根据所述CSD序列的前K个元素确定的。
- 根据权利要求1-3任一项所述的方法,其特征在于,所述L等于16,所述CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,所述CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
- 根据权利要求1-3任一项所述的方法,其特征在于,所述L等于16,所述CSD序列的第一个元素为0,所述CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
- 一种基于循环移位分集序列的通信方法,其特征在于,所述方法包括:第二通信装置接收来自第一通信装置的物理层协议数据单元PPDU,所述PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,所述STF、所述LTF、以及所述数据字段是根据循环移位分集CSD序列确定的,所述CSD序列包括L个元素,L为所述第一通信装置支持的最大空间流数,所述最大空间流数大于或等于16;所述第二通信装置根据所述PPDU进行处理。
- 根据权利要求6所述的方法,其特征在于,所述第二通信装置接收来自第一通信装置的PPDU,包括:所述第二通信装置通过K个空间流接收来自所述第一通信装置的所述PPDU。
- 根据权利要求7所述的方法,其特征在于,所述STF、所述LTF、以及所述数据字段是根据所述CSD序列的前K个元素确定的。
- 根据权利要求6-8任一项所述的方法,其特征在于,所述L等于16,所述CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,所述CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
- 根据权利要求6-8任一项所述的方法,其特征在于,所述L等于16,所述CSD序列的第一个元素为0,所述CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
- 一种第一通信装置,其特征在于,所述第一通信装置包括:处理模块和收发模块;所述处理模块,用于生成物理层协议数据单元PPDU,所述PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,所述STF、所述LTF、以及所述数据字段是根据循环移位分集CSD序列确定的,所述CSD序列包括L个元素,L为所述第一通信装置支持的最大空间流数,所述最大空间流数大于或等于16;所述收发模块,用于向第二通信装置发送所述PPDU。
- 根据权利要求11所述的第一通信装置,其特征在于,所述收发模块,用于向所述第二通信装置发送所述PPDU,包括:所述收发模块,用于通过K个空间流向所述第二通信装置发送所述PPDU,K为小于或等于L的正整数。
- 根据权利要求12所述的第一通信装置,其特征在于,所述STF、所述LTF、以及所述数据字段是根据所述CSD序列的前K个元素确定的。
- 根据权利要求11-13任一项所述的第一通信装置,其特征在于,所述L等于16,所述CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,所述CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
- 根据权利要求11-13任一项所述的第一通信装置,其特征在于,所述L等于16,所述CSD序列的第一个元素为0,所述CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
- 一种第二通信装置,其特征在于,所述第二通信装置包括:处理模块和收发模块;所述收发模块,用于接收来自第一通信装置的物理层协议数据单元PPDU,所述PPDU包括短训练字段STF、长训练字段LTF、以及数据字段,所述STF、所述LTF、以及所述数据字段是根据循环移位分集CSD序列确定的,所述CSD序列包括L个元素,L为所述第一通信装置支持的最大空间流数,所述最大空间流数大于或等于16;所述处理模块,用于根据所述PPDU进行处理。
- 根据权利要求16所述的第二通信装置,其特征在于,所述收发模块,用于接收来自第一通信装置的PPDU,包括:所述收发模块,用于通过K个空间流接收来自所述第一通信装置的所述PPDU。
- 根据权利要求17所述的第二通信装置,其特征在于,所述STF、所述LTF、以及所述数据字段是根据所述CSD序列的前K个元素确定的。
- 根据权利要求16-18任一项所述的第二通信装置,其特征在于,所述L等于16,所述CSD序列的前8个元素分别为:0、-400、-200、-600、-350、-650、-100、-750,所述CSD序列的后8个元素包括:-550、-250、-500、-150、-700、-50、-450、-300。
- 根据权利要求16-18任一项所述的第二通信装置,其特征在于,所述L等于16,所述CSD序列的第一个元素为0,所述CSD序列的后15个元素包括:-550、-225、-675、-325、-100、-450、-275、-500、-50、-725、-600、-375、-150、-575、-475。
- 一种通信装置,其特征在于,所述通信装置包括:处理器;所述处理器,用于执行存储器中存储的计算机执行指令,以使所述通信装置执行如权利要求1-5中任一项所述的方法,或者,以使所述通信装置执行如权利要求6-10中任一项所述的方法。
- 一种通信装置,其特征在于,所述通信装置包括:处理器和通信接口;所述通信接口,用于与所述通信装置之外的模块通信;所述处理器用于执行计算机执行指令,以使所述通信装置执行如权利要求1-5中任一项所述的方法,或者,以使所述通信装置执行如权利要求6-10中任一项所述的方法。
- 一种通信装置,其特征在于,所述通信装置包括:接口电路和逻辑电路;所述接口电路,用于获取输入信息和/或输出输出信息;所述逻辑电路用于执行权利要求1-5中任一项所述的方法,或者执行权利要求6-10中任 一项所述的方法,根据所述输入信息进行处理和/或生成所述输出信息。
- 一种计算机可读存储介质,其特征在于,包括指令,当所述指令在通信装置上运行时,以使所述通信装置执行如权利要求1-5中任一项所述的方法,或者,以使所述通信装置执行如权利要求6-10中任一项所述的方法。
- 一种通信系统,其特征在于,所述通信系统包括如权利要求11-15任一项所述的第一通信装置,以及如权利要求16-20任一项所述的第二通信装置。
- 一种计算机程序产品,其特征在于,当所述计算机程序产品在通信装置上运行时,如权利要求1-5中任一项所述的方法被实现;或者,如权利要求6-10中任一项所述的方法被实现。
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US20150023335A1 (en) * | 2013-07-17 | 2015-01-22 | Qualcomm Incorporated | Physical layer design for uplink (ul) multiuser multiple-input, multiple-output (mu-mimo) in wireless local area network (wlan) systems |
US20180263033A1 (en) * | 2015-02-27 | 2018-09-13 | Intel IP Corporation | Uplink long training field sequences in wireless communications |
US20200177425A1 (en) * | 2019-02-06 | 2020-06-04 | Xiaogang Chen | Channel width, spatial streams, and short packet signaling |
CN111344981A (zh) * | 2017-10-13 | 2020-06-26 | 高通股份有限公司 | 管理下一代极高吞吐量(eht)wi-fi系统中的大量空间时间流 |
CN111817764A (zh) * | 2019-04-11 | 2020-10-23 | 华为技术有限公司 | 一种筛选循环位移延迟序列的方法以及相关装置 |
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US20150023335A1 (en) * | 2013-07-17 | 2015-01-22 | Qualcomm Incorporated | Physical layer design for uplink (ul) multiuser multiple-input, multiple-output (mu-mimo) in wireless local area network (wlan) systems |
US20180263033A1 (en) * | 2015-02-27 | 2018-09-13 | Intel IP Corporation | Uplink long training field sequences in wireless communications |
CN111344981A (zh) * | 2017-10-13 | 2020-06-26 | 高通股份有限公司 | 管理下一代极高吞吐量(eht)wi-fi系统中的大量空间时间流 |
US20200177425A1 (en) * | 2019-02-06 | 2020-06-04 | Xiaogang Chen | Channel width, spatial streams, and short packet signaling |
CN111817764A (zh) * | 2019-04-11 | 2020-10-23 | 华为技术有限公司 | 一种筛选循环位移延迟序列的方法以及相关装置 |
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